build container on push

.forgejo/workflows/build.yaml

@@ -0,0 +1,25 @@
+on:
+  push:
+
+jobs:
+  build:
+    runs-on: docker
+    container:
+      image: quay.io/fedora/fedora-minimal:40
+    steps:
+      - run: dnf5 install -y nodejs tar xz git buildah podman skopeo just
+      - uses: https://code.forgejo.org/actions/checkout@v4
+      - name: build image
+        run: just build "--storage-driver=vfs"
+      
+      - name: export image
+        run: podman --storage-driver=vfs save rssmix:latest -o image.tar
+      - name: set registry env
+        run: |
+          set -euxo pipefail
+          echo "DOCKER_REGISTRY=$(echo ${{ GITHUB.SERVER_URL }} | sed -E 's/^\s*.*:\/\///g' )" >> $GITHUB_ENV
+      - run: echo DOCKER_REGISTRY=$DOCKER_REGISTRY
+      - name: log into docker
+        run: skopeo login -u ${{ GITHUB.REPOSITORY_OWNER }} -p ${{ SECRETS.PACKAGE_PUSH_KEY }} $DOCKER_REGISTRY
+      - name: upload image
+        run: skopeo copy docker-archive:image.tar docker://$DOCKER_REGISTRY/${{ GITHUB.REPOSITORY_OWNER }}/rssmix:latest