feat: Added workflow to build and push images to ghcr

.github/workflows/build.yml

@@ -0,0 +1,92 @@
+name: Publish and Sign Container Images
+
+env:
+  REGISTRY: ghcr.io
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - .github/workflows/build.yml
+      - "**/Dockerfile"
+  # schedule:
+    # - cron: "17 07 * * 0"
+
+jobs:
+  build-push-image:
+    runs-on: ubuntu-24.04
+
+    permissions:
+      contents: read
+      packages: write
+      id-token: write
+
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - image: spotify-distrobox
+            file: distroboxes/spotify/Dockerfile
+          - image: steam-distrobox
+            file: distroboxes/steam/Dockerfile
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Get Secrets
+        uses: bitwarden/sm-action@v2
+        with:
+          access_token: ${{ secrets.BWS_TOKEN }}
+          base_url: https://vault.bitwarden.eu
+          secrets: |
+            3200b4c5-5543-4f22-83b2-b24000e08512 > COSIGN_PRIVATE_KEY
+
+      - name: Setup Docker buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Install cosign
+        uses: sigstore/cosign-installer@v3
+        with:
+          cosign-release: "v2.4.1"
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: |
+            ${{ env.REGISTRY }}/${{ github.repository }}/${{ matrix.image }}
+          tags: |
+            latest
+            type=sha,format=long
+            type=schedule
+
+      - name: Log into ${{ env.REGISTRY }}
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.repository_owner }}
+          password: ${{ github.token }}
+
+      - name: Build and push container image
+        id: push-step
+        uses: docker/build-push-action@v6
+        with:
+          push: true
+          file: ${{ matrix.file }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
+      - name: Sign the container image
+        run: |
+          cosign sign --yes --key env://COSIGN_PRIVATE_KEY ${{ env.REGISTRY }}/${{ github.repository }}/${{ matrix.image }}@${{ steps.push-step.outputs.digest }} ${{ steps.meta.outputs.tags }}
+
+      - name: Cleanup old images
+        uses: actions/delete-package-versions@v5
+        with:
+          package-name: ${{ matrix.image }}
+          package-type: container
+          min-versions-to-keep: 60