Renamed Runner Dockerfiles (#1248)

Renamed the runner dockerfiles so that we have proper syntax highlighting for them, as well as a consistent way to map from the image name to the dockerfile. Added a `.dockerignore` file to avoid uploading things to the daemon that we never use.

.github/workflows/runners.yml

@@ -34,11 +34,9 @@ jobs:
           - name: actions-runner
             os-name: ubuntu
             os-version: 20.04
-            dockerfile: Dockerfile
           - name: actions-runner-dind
             os-name: ubuntu
             os-version: 20.04
-            dockerfile: Dockerfile.dindrunner
 
     steps:
       - name: Checkout
@@ -57,7 +55,7 @@ jobs:
         uses: docker/build-push-action@c5e6528d5ddefc82f682165021e05edf58044bce
         with:
           context: ./runner
-          file: ./runner/${{ matrix.dockerfile }}
+          file: ./runner/${{ matrix.name }}.dockerfile
           platforms: linux/amd64,linux/arm64
           push: ${{ github.ref == 'master' && github.event.pull_request.merged == true }}
           build-args: |

runner/.dockerignore

@@ -0,0 +1,2 @@
+*.dockerfile
+Makefile

runner/Makefile

@@ -25,8 +25,18 @@ else
 endif
 
 docker-build-ubuntu:
-	docker build --build-arg TARGETPLATFORM=${TARGETPLATFORM} --build-arg RUNNER_VERSION=${RUNNER_VERSION} --build-arg DOCKER_VERSION=${DOCKER_VERSION} -t ${NAME}:${TAG} .
-	docker build --build-arg TARGETPLATFORM=${TARGETPLATFORM} --build-arg RUNNER_VERSION=${RUNNER_VERSION} --build-arg DOCKER_VERSION=${DOCKER_VERSION} -t ${DIND_RUNNER_NAME}:${TAG} -f Dockerfile.dindrunner .
+	docker build \
+	  --build-arg TARGETPLATFORM=${TARGETPLATFORM} \
+	  --build-arg RUNNER_VERSION=${RUNNER_VERSION} \
+	  --build-arg DOCKER_VERSION=${DOCKER_VERSION} \
+	  -f actions-runner.dockerfile \
+	  -t ${NAME}:${TAG} .
+	docker build \
+	  --build-arg TARGETPLATFORM=${TARGETPLATFORM} \
+	  --build-arg RUNNER_VERSION=${RUNNER_VERSION} \
+	  --build-arg DOCKER_VERSION=${DOCKER_VERSION} \
+	  -f actions-runner-dind.dockerfile \
+	  -t ${DIND_RUNNER_NAME}:${TAG} .
 
 docker-push-ubuntu:
 	docker push ${NAME}:${TAG}
@@ -41,12 +51,12 @@ docker-buildx-ubuntu:
 	docker buildx build --platform ${PLATFORMS} \
 	  --build-arg RUNNER_VERSION=${RUNNER_VERSION} \
 	  --build-arg DOCKER_VERSION=${DOCKER_VERSION} \
+	  -f actions-runner.dockerfile \
 	  -t "${NAME}:${TAG}" \
-		-f Dockerfile \
 	  . ${PUSH_ARG}
 	docker buildx build --platform ${PLATFORMS} \
 	  --build-arg RUNNER_VERSION=${RUNNER_VERSION} \
 	  --build-arg DOCKER_VERSION=${DOCKER_VERSION} \
+	  -f actions-runner-dind.dockerfile \
 	  -t "${DIND_RUNNER_NAME}:${TAG}" \
-		-f Dockerfile.dindrunner \
 	  . ${PUSH_ARG}