build: update container latest tag when releasing

.github/workflows/releases.yaml

@@ -23,7 +23,9 @@ jobs:
         env:
           USER: ${{ secrets.QUAY_USERNAME }}
           PASS: ${{ secrets.QUAY_PASSWORD }}
-        run: docker login -u "$USER" -p "$PASS" quay.io && make push
+        run: |
+          docker login -u "$USER" -p "$PASS" quay.io 
+          make push && make latest
       - name: Compress Release Binary
         run: gzip ./faas
       - name: Create Release

Makefile

@@ -17,21 +17,27 @@ test:
 	go test -cover -coverprofile=coverage.out ./...
 
 image: Dockerfile
-	docker build -t $(REPO):$(VERS) \
+	docker build -t $(REPO):latest  \
+	             -t $(REPO):$(VERS) \
 	             -t $(REPO):$(HASH) \
 	             -t $(REPO):$(DATE)-$(VERS)-$(HASH) .
 
-push: image
-	docker push $(REPO):$(VERS)
-	docker push $(REPO):$(HASH)
-	docker push $(REPO):$(DATE)-$(VERS)-$(HASH)
-
 release: build test
 	go get -u github.com/git-chglog/git-chglog/cmd/git-chglog
 	git-chglog --next-tag $(VTAG) -o CHANGELOG.md
 	git commit -am "release: $(VTAG)"
 	git tag $(VTAG)
 
+push: image
+	docker push $(REPO):$(VERS)
+	docker push $(REPO):$(HASH)
+	docker push $(REPO):$(DATE)-$(VERS)-$(HASH)
+
+latest:
+	# push the local 'latest' tag as the new public latest version
+	# (run by CI only for releases)
+	docker push $(REPO):latest
+
 clean:
 	-@rm -f $(BIN)
 	-@rm -f coverage.out