produce kedacore/build-tools image in GitHub Action (#979)

Signed-off-by: Zbynek Roubalik <[email protected]>

.github/workflows/build-tools.yml

@@ -0,0 +1,26 @@
+name: build-tools CI
+on:
+  push:
+    branches:
+      - master
+      - v2
+    paths:
+      - 'tools/**'
+jobs:
+  validate:
+    name: Validate
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v1
+        with:
+          fetch-depth: 1
+
+      - name: Login to Docker Hub
+        env:
+          DOCKER_HUB_ACCESS_TOKEN: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
+          DOCKER_HUB_USERNAME: ${{ secrets.DOCKER_HUB_USERNAME }}
+        run: echo $DOCKER_HUB_ACCESS_TOKEN | docker login -u $DOCKER_HUB_USERNAME --password-stdin
+
+      - name: Build and publish Tools image
+        run: make publish-build-tools

Makefile

@@ -8,6 +8,8 @@ IMAGE_REPO     ?= kedacore
 IMAGE_CONTROLLER = $(IMAGE_REGISTRY)/$(IMAGE_REPO)/keda:$(VERSION)
 IMAGE_ADAPTER    = $(IMAGE_REGISTRY)/$(IMAGE_REPO)/keda-metrics-adapter:$(VERSION)
 
+IMAGE_BUILD_TOOLS = $(IMAGE_REGISTRY)/$(IMAGE_REPO)/build-tools:latest
+
 ARCH       ?=amd64
 CGO        ?=0
 TARGET_OS  ?=linux
@@ -115,3 +117,11 @@ pkg/scalers/liiklus/LiiklusService.pb.go: hack/LiiklusService.proto
 
 pkg/scalers/liiklus/mocks/mock_liiklus.go: pkg/scalers/liiklus/LiiklusService.pb.go
 	mockgen github.com/kedacore/keda/pkg/scalers/liiklus LiiklusServiceClient > pkg/scalers/liiklus/mocks/mock_liiklus.go
+
+##################################################
+# Build Tools Image                              #
+##################################################
+.PHONY: publish-build-tools
+publish-build-tools:
+	docker build -f tools/build-tools.Dockerfile -t $(IMAGE_BUILD_TOOLS) .
+	docker push $(IMAGE_BUILD_TOOLS)