Modify CI to push multiple tags

The retagging commands don't work with quay.io, so instead we can use the multiple --tag parameters allowed
in the `docker buildx build` command. This makes the `release-tag` workflow redundant, as all it did was
perform that retagging.

Now, when a commit is merged to master, an image should be created for `latest`, `canary` and the commit SHA. When
a tag is pushed, an image should be created for `latest`, `canary` and the tag.

Signed-off-by: David Bond <[email protected]>

Author: davidsbond

.github/workflows/release-master.yml

@@ -5,7 +5,8 @@ on:
   push:
     branches:
       - master
-
+    tags:
+      - v*
 jobs:
   golint:
     name: vet fmt and lint
@@ -55,5 +56,3 @@ jobs:
         password: ${{ secrets.QUAY_PASSWORD }}
     - name: Build and push
       run: make push-docker-image
-    - name: Tag
-      run: make create-docker-image-tag NEW_TAG=canary

.github/workflows/release-tag.yml

@@ -97,17 +97,15 @@ build_buildx_args=$(BUILDX_EXTRA_ARGS)
 .PHONY: _docker-%
 _docker-%: build-all-platforms
 	docker buildx build --platform $(PLATFORMS) \
-	--tag $(DOCKER_IMAGE_TAG) \
+	--tag $(DOCKER_IMAGE):$(VERSION) \
+	--tag $(DOCKER_IMAGE):latest \
+	--tag $(DOCKER_IMAGE):canary \
 	$($*_buildx_args) \
 	.
 
 build-docker-image: _docker-build
 push-docker-image: _docker-push
 
-NEW_TAG?=latest
-create-docker-image-tag:
-	docker buildx imagetools create $(DOCKER_IMAGE):$(COMMIT) --tag $(DOCKER_IMAGE):$(NEW_TAG)
-
 # CI
 
 export PATH:=$(GOPATH)/bin:$(PATH)