Bump actions/checkout from 5 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.forgejo/workflows/deploy.yml

@@ -1,31 +0,0 @@
-name: Deploy to Pages
-
-on:
-  push:
-    branches: ['main']
-  pull_request:
-    branches: ['main']
-  workflow_dispatch:
-
-concurrency:
-  group: 'pages'
-  cancel-in-progress: false
-
-jobs:
-  deploy:
-    runs-on: docker
-
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Validate static frontend
-        run: |
-          test -f frontend/index.html
-          test -f frontend/fizika.json
-
-      - name: Copy frontend to host pages mount
-        if: github.event_name == 'push' && github.ref == 'refs/heads/main'
-        run: |
-          apt update && apt install -y rsync
-          mkdir -p /pages
-          rsync -a --delete frontend/ /pages/fizika

.forgejo/workflows/docker-publish.yml

@@ -1,63 +0,0 @@
-name: Build and Publish Docker Image
-
-on:
-  push:
-    branches: ['main']
-    tags: ['v*']
-  pull_request:
-    branches: ['main']
-  workflow_dispatch:
-
-env:
-  IMAGE_NAME: ${{ forgejo.repository }}/fizika-admin
-
-jobs:
-  build-and-push:
-    runs-on: ubuntu-docker
-
-    steps:
-      - name: Checkout repository
-        uses: https://code.forgejo.org/actions/checkout@v4
-
-      - name: Extract registry host
-        id: registry
-        run: echo "host=$(echo '${{ forgejo.server_url }}' | sed 's|https\?://||')" >> "$GITHUB_OUTPUT"
-
-      - name: Log into Forgejo registry
-        if: forgejo.event_name != 'pull_request'
-        run: echo "${{ secrets.FORGEJO_TOKEN }}" | docker login "${{ steps.registry.outputs.host }}" -u "${{ forgejo.actor }}" --password-stdin
-
-      - name: Build Docker image
-        run: |
-          IMAGE="${{ steps.registry.outputs.host }}/$(echo "${{ env.IMAGE_NAME }}" | tr '[:upper:]' '[:lower:]')"
-          SHA_SHORT="$(echo "${{ forgejo.sha }}" | cut -c1-12)"
-          TAG_ARGS="-t ${IMAGE}:sha-${SHA_SHORT}"
-
-          if [ "${{ forgejo.ref }}" = "refs/heads/main" ]; then
-            TAG_ARGS="${TAG_ARGS} -t ${IMAGE}:main -t ${IMAGE}:latest"
-          fi
-
-          if [ "${{ forgejo.ref_type }}" = "tag" ]; then
-            REF_NAME="${{ forgejo.ref_name }}"
-            TAG_ARGS="${TAG_ARGS} -t ${IMAGE}:${REF_NAME}"
-
-            if echo "$REF_NAME" | grep -Eq '^v[0-9]+\.[0-9]+\.[0-9]+$'; then
-              VERSION="${REF_NAME#v}"
-              MAJOR_MINOR="$(echo "$VERSION" | cut -d. -f1,2)"
-              MAJOR="$(echo "$VERSION" | cut -d. -f1)"
-              TAG_ARGS="${TAG_ARGS} -t ${IMAGE}:${VERSION} -t ${IMAGE}:${MAJOR_MINOR} -t ${IMAGE}:${MAJOR}"
-            fi
-          fi
-
-          docker build \
-            --label "org.opencontainers.image.source=${{ forgejo.server_url }}/${{ forgejo.repository }}" \
-            --label "org.opencontainers.image.revision=${{ forgejo.sha }}" \
-            --label "org.opencontainers.image.created=$(date -u +'%Y-%m-%dT%H:%M:%SZ')" \
-            ${TAG_ARGS} \
-            ./backend
-
-          echo "IMAGE=${IMAGE}" >> "$GITHUB_ENV"
-
-      - name: Push Docker image
-        if: forgejo.event_name != 'pull_request'
-        run: docker push --all-tags "$IMAGE"

.github/dependabot.yml

@@ -0,0 +1,6 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"

.github/workflows/deploy.yaml

@@ -0,0 +1,36 @@
+name: Deploy to Pages
+
+on:
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+# Allow only one concurrent deployment, skipping runs queued between the run in-progress and latest queued.
+# However, do NOT cancel in-progress runs as we want to allow these production deployments to complete.
+concurrency:
+  group: "pages"
+  cancel-in-progress: false
+
+jobs:
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+      - name: Setup Pages
+        uses: actions/configure-pages@v5
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v4
+        with:
+          path: "frontend"
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4

.github/workflows/docker-publish.yml

@@ -0,0 +1,86 @@
+name: Build and Publish Docker Image
+
+on:
+  push:
+    branches: ["main"]
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}/fizika-admin
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+      # This is used to complete the identity challenge
+      # with sigstore/fulcio when running outside of PRs.
+      id-token: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+
+      - name: Setup Docker buildx
+        uses: docker/setup-buildx-action@v3
+
+      # Login against a Docker registry except on PR
+      # https://github.com/docker/login-action
+      - name: Log into registry ${{ env.REGISTRY }}
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      # Extract metadata (tags, labels) for Docker
+      # https://github.com/docker/metadata-action
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+            type=sha,prefix={{branch}}-
+            # set latest tag for default branch
+            type=raw,value=latest,enable={{is_default_branch}}
+
+      # Build and push Docker image with Buildx (don't push on PR)
+      # https://github.com/docker/build-push-action
+      - name: Build and push Docker image
+        id: build-and-push
+        uses: docker/build-push-action@v5
+        with:
+          context: ./backend
+          file: ./backend/Dockerfile
+          platforms: linux/amd64,linux/arm64
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+          # Security scanning
+          sbom: true
+          provenance: true
+
+      # Sign the resulting Docker image digest.
+      # This will only write to the public Rekor transparency log when the Docker
+      # repository is public to avoid leaking data. If you would like to publish
+      # transparency data even for private images, pass --force to cosign below.
+      # https://github.com/sigstore/cosign
+      - name: Sign the published Docker image
+        if: ${{ github.ref_type == 'tag' }}
+        env:
+          # https://docs.github.com/en/actions/security-guides/security-hardening-for-github-actions#using-an-intermediate-environment-variable
+          TAGS: ${{ steps.meta.outputs.tags }}
+          DIGEST: ${{ steps.build-and-push.outputs.digest }}
+        # This step uses the identity token to provision an ephemeral certificate
+        # against the sigstore community Fulcio instance.
+        run: echo "${TAGS}" | xargs -I {} cosign sign --yes {}@${DIGEST}