gh action to upload rootfs on gh release + downloading rootfs from there

.github/workflows/docker-rootfs-asset.yml

@@ -0,0 +1,87 @@
+name: Create Docker rootfs assets
+
+on:
+  workflow_run:
+    workflows: ["Create and publish a Docker image"]
+    types:
+      - completed
+    branches:
+      - main
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  create-rootfs-assets:
+    runs-on: ubuntu-latest
+    if: ${{ github.event.workflow_run.conclusion == 'success' }}
+    permissions:
+      contents: write
+      packages: read
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@master
+        with:
+          platforms: all
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@master
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Get latest release tag
+        id: get_tag
+        run: |
+          LATEST_TAG=$(curl -s https://api.github.com/repos/${{ github.repository }}/releases/latest | jq -r '.tag_name')
+          echo "tag=$LATEST_TAG" >> $GITHUB_OUTPUT
+          echo "Latest release tag: $LATEST_TAG"
+
+      - name: Export rootfs for amd64
+        run: |
+          echo "Creating and exporting amd64 container..."
+          CONTAINER_ID=$(docker create --platform linux/amd64 ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ steps.get_tag.outputs.tag }})
+          docker export $CONTAINER_ID --output="firegex-rootfs-amd64.tar"
+          docker rm $CONTAINER_ID
+          echo "Compressing amd64 rootfs..."
+          gzip firegex-rootfs-amd64.tar
+          ls -lh firegex-rootfs-amd64.tar.gz
+
+      - name: Export rootfs for arm64
+        run: |
+          echo "Creating and exporting arm64 container..."
+          CONTAINER_ID=$(docker create --platform linux/arm64 ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ steps.get_tag.outputs.tag }})
+          docker export $CONTAINER_ID --output="firegex-rootfs-arm64.tar"
+          docker rm $CONTAINER_ID
+          echo "Compressing arm64 rootfs..."
+          gzip firegex-rootfs-arm64.tar
+          ls -lh firegex-rootfs-arm64.tar.gz
+
+      - name: Calculate checksums
+        run: |
+          echo "Calculating checksums..."
+          sha256sum firegex-rootfs-amd64.tar.gz > firegex-rootfs-amd64.tar.gz.sha256
+          sha256sum firegex-rootfs-arm64.tar.gz > firegex-rootfs-arm64.tar.gz.sha256
+          cat *.sha256
+
+      - name: Upload rootfs assets to release
+        run: |
+          echo "Uploading assets to release ${{ steps.get_tag.outputs.tag }}..."
+          gh release upload ${{ steps.get_tag.outputs.tag }} \
+            firegex-rootfs-amd64.tar.gz \
+            firegex-rootfs-amd64.tar.gz.sha256 \
+            firegex-rootfs-arm64.tar.gz \
+            firegex-rootfs-arm64.tar.gz.sha256 \
+            --clobber
+          echo "Assets uploaded successfully!"
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}