[gha] build and publish release containers

.github/workflows/docker.yml

@@ -1,6 +1,6 @@
 name: Build containers
 
-on: push
+on: [push]
 
 jobs:
   docker:
@@ -32,7 +32,8 @@ jobs:
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
-      - name: Build and push
+      - name: Build and push trunk container
+        if: ${{ !startsWith(github.ref, 'refs/tags/') }}
         uses: docker/build-push-action@v2
         with:
           context: ./contrib/docker
@@ -42,3 +43,21 @@ jobs:
           tags: |
             purplei2p/i2pd:latest
             ghcr.io/purplei2p/i2pd:latest
+
+      - name: Set env
+        if: ${{ startsWith(github.ref, 'refs/tags/') }}
+        run: echo "RELEASE_VERSION=${GITHUB_REF:10}" >> $GITHUB_ENV
+
+      - name: Build and push release container
+        if: ${{ startsWith(github.ref, 'refs/tags/') }}
+        uses: docker/build-push-action@v2
+        with:
+          context: ./contrib/docker
+          file: ./contrib/docker/Dockerfile
+          platforms: linux/amd64,linux/386
+          push: true
+          tags: |
+            purplei2p/i2pd:latest
+            purplei2p/i2pd:release-${{ env.RELEASE_VERSION }}
+            ghcr.io/purplei2p/i2pd:latest
+            ghcr.io/purplei2p/i2pd:release-${{ env.RELEASE_VERSION }}