feat: publish container images for interop-test binaries (#3383)

This patch adds a workflow that automatically publishes a docker image of our `ping` interop-test binaries on every release. Releases are different from Git tags. We publish a tag for each version of each crate but only a single release for each version of the `libp2p` crate.

Alternatively, this workflow can also be triggered manually:

![image](https://user-images.githubusercontent.com/5486389/214460448-d4fca593-d323-4476-956f-d180aadf8850.png)

1. Select the Git ref you want to run the workflow on. This should be the version of `libp2p` you want to publish the test binary for. For example, if you want to publish a version of the test binary for a hotfix release of a sub-crate, you would pick the respective tag of the hotfix release.
2. Choose the tag of the docker image.

To resolve https://github.com/libp2p/test-plans/issues/112, I am planning to create branches off current master that hardcodes the libp2p version in the test-binary to a particular one and then trigger this workflow for the respective branch.

.github/workflows/interop-test.yml

@@ -26,7 +26,7 @@ jobs:
       - name: Build image
         run: |
           cargo build --release -p interop-tests
-          docker build -t rust-libp2p-head --build-arg=TEST_BINARY=target/release/ping . -f ./interop-tests/Dockerfile
+          docker build -t rust-libp2p-head --build-arg=TEST_BINARY=target/release/ping . -f interop-tests/Dockerfile
           docker image save -o ./interop-tests/ping-image.tar rust-libp2p-head
       - name: Upload ping versions info
         uses: actions/upload-artifact@v3

.github/workflows/publish-interop-test-images.yml

@@ -0,0 +1,53 @@
+name: Publish interop test docker images
+
+on:
+  release:
+    types: [ created ] # Publishing of a containers is triggered on _releases_. Releases are a GH concept building on top of tags.
+  workflow_dispatch: # This workflow can also be triggered manually which is useful for testing, updates to test binaries or publishing of test binaries for older libp2p versions.
+    inputs:
+      dockerTag:
+        description: 'Docker image tag'
+        required: true
+
+env:
+  REGISTRY: ghcr.io
+  PING_TEST_IMAGE_NAME: ${{ github.repository }}/ping-interop-test
+
+jobs:
+  publish-interop-test-images:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: actions-rs/toolchain@16499b5e05bf2e26879000db0c1d13f7e13fa3af # v1.0.7
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+
+      - uses: Swatinem/rust-cache@359a70e43a0bb8a13953b04a90f76428b4959bb6 # v2.2.0
+        with:
+          shared-key: interop-tests
+          save-if: false
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@f054a8b539a109f9f41c372932f1ae047eff08c9
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build test binaries
+        run: |
+          sudo apt-get install protobuf-compiler
+          cargo build --release -p interop-tests
+
+      - name: Build and push ping interop docker image
+        run: |
+          TAG="${{ env.REGISTRY }}/${{ env.PING_TEST_IMAGE_NAME }}:${{ inputs.dockerTag || github.event.release.tag_name }}"
+          
+          docker build -t $TAG --build-arg=TEST_BINARY=target/release/ping . -f interop-tests/Dockerfile
+          docker push $TAG

interop-tests/Dockerfile

@@ -1,5 +1,6 @@
 FROM ubuntu:22.04
 ARG TEST_BINARY
 COPY $TEST_BINARY /usr/local/bin/testplan
+LABEL org.opencontainers.image.source https://github.com/libp2p/rust-libp2p
 ENV RUST_BACKTRACE=1
 ENTRYPOINT ["testplan"]