Create tagged image when publishing a release (#43)

Signed-off-by: Nicko Guyer <[email protected]>

Author: nguyer

.github/workflows/docker.yml

@@ -1,9 +1,8 @@
 name: Docker
 
 on:
-  push:
-    branches:
-      - main
+  release:
+    types: [published, prereleased]
 
 jobs:
   docker:
@@ -12,9 +11,19 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Build
-        run: docker build -t ghcr.io/hyperledger/firefly-dataexchange-https:latest .
-
-      - name: Push
+        run: docker build -t ghcr.io/hyperledger/firefly-dataexchange-https:${GITHUB_REF##*/} .
+      
+      - name: Tag release
+        if: github.event.action == 'published'
+        run: docker tag ghcr.io/hyperledger/firefly-dataexchange-https:${GITHUB_REF##*/} ghcr.io/hyperledger/firefly-dataexchange-https:latest
+      
+      - name: Push docker image
+        run: |
+          echo ${{ secrets.GITHUB_TOKEN }} | docker login ghcr.io -u $GITHUB_ACTOR --password-stdin
+          docker push ghcr.io/hyperledger/firefly-dataexchange-https:${GITHUB_REF##*/}
+      
+      - name: Push latest tag
+        if: github.event.action == 'published'
         run: |
           echo ${{ secrets.GITHUB_TOKEN }} | docker login ghcr.io -u $GITHUB_ACTOR --password-stdin
-          docker push ghcr.io/hyperledger/firefly-dataexchange-https:latest
+          docker push ghcr.io/hyperledger/firefly-dataexchange-https:latest