ci: use custom action for multi stage build and publish

.github/workflows/multistage-docker-build-action.yml

@@ -0,0 +1,43 @@
+name: Multi stage build and publish
+
+on:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+
+env:
+    IMAGE_REGISTRY: ghcr.io/${{ github.repository }}
+
+jobs:
+  build-and-publish:
+    name: Build and publish
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - uses: actions/checkout@v2
+
+      # This step MUST be performed before multistage-docker-build
+      - name: Auth to GH registry
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ github.token }}
+
+      - name: lowercase IMAGE_REGISTRY
+        run: |
+          echo "IMAGE_REGISTRY=${IMAGE_REGISTRY@L}" >> ${GITHUB_ENV}
+
+      - uses: firehed/multistage-docker-build-action@v1
+        id: build
+        with:
+          context: ./rusty-fedora.container
+          dockerfile: rusty-fedora.container/Containerfile
+          repository: ${{ env.IMAGE_REGISTRY }}
+          stages: builder
+          server-stage: fedora-oxidized.toolbox
+

rusty-fedora.container/Containerfile

@@ -8,17 +8,17 @@ RUN cargo install $(cat useful-crates)
 RUN rm /useful-crates
 
 
-FROM quay.io/toolbx-images/fedora-toolbox:39
+FROM quay.io/toolbx-images/fedora-toolbox:39 as fedora-oxidized.toolbox
 
-ARG NAME=rusty-fedora.toolbx
+ARG NAME=fedora-oxidized.toolbox
 ARG VERSION=39
 LABEL com.github.containers.toolbox="true" \
       com.redhat.component="$NAME" \
       name="$NAME" \
       version="$VERSION" \
       usage="This image is meant to be used with the toolbx or distrobox command" \
-      summary="Rusted image based on Fedora Toolbx base container" \
-      maintainer="nain <no-reply@you-are-on-your-own.alt>"
+      summary="Rusted image based on Fedora Toolbox base container" \
+      maintainer="nain <no-reply@you-are-on-your-own-for-now.alt>"
 
 RUN mkdir -p /opt/cargo/bin
 COPY --from=builder /usr/local/cargo/bin/* /opt/cargo/bin/