feat: add release CI build

* Uses goreleaser to generate binaries for different platforms and post
it on github releases
* Triggers on tagging (done manually for now)
* Changes go-build make targets to build to /dev/null as we are mostly
interested in checking whether we are able to build and not generating
any binaries

.cloudbuild/Makefile

@@ -4,7 +4,12 @@ gcp_build_project := einride-build
 .PHONY: all
 all: \
 	triggers-create-review \
+	triggers-create-release \
 
 .PHONY: triggers-create-review
 triggers-create-review: $(cloudbuild_cwd)/triggers/review.yaml $(cloudbuild_cwd)/configs/review.yaml
 	gcloud beta builds triggers create github --project $(gcp_build_project) --trigger-config=$<
+
+.PHONY: triggers-create-release
+triggers-create-release: $(cloudbuild_cwd)/triggers/release.yaml $(cloudbuild_cwd)/configs/release.yaml
+	gcloud beta builds triggers create github --project $(gcp_build_project) --trigger-config=$<

.cloudbuild/configs/release.yaml

@@ -0,0 +1,34 @@
+steps:
+  - id: fetch github token
+    name: gcr.io/cloud-builders/gcloud
+    entrypoint: "bash"
+    args:
+      - "-c"
+      - "gcloud secrets versions access latest --secret=einride-bot-github-token --project=einride-terraform > github.token"
+
+  - id: setup git credentials
+    name: gcr.io/cloud-builders/gcloud
+    entrypoint: "bash"
+    args:
+      - "-c"
+      - |
+        echo -e "https://git:$(cat github.token)@github.com" > $${HOME}/.git-credentials \
+        && git config --global credential.helper store \
+        && git fetch --unshallow
+    volumes:
+      - name: "home-folder"
+        path: /root
+
+  - id: make
+    name: golang:1.16
+    args: ["make"]
+
+  - id: release go binaries
+    name: goreleaser/goreleaser
+    entrypoint: "/bin/sh"
+    args:
+      - "-c"
+      - 'export GITHUB_TOKEN="$(cat github.token)" && goreleaser'
+    volumes:
+      - name: "home-folder"
+        path: /root

.cloudbuild/configs/review.yaml

@@ -1,3 +1,4 @@
 steps:
-  - name: golang:1.16
-    args: ["make"]
+  - id: make
+    name: golang:1.16
+    args: ["make"]

.cloudbuild/triggers/release.yaml

@@ -0,0 +1,8 @@
+name: ghcomment-release
+description: "Release pipeline"
+filename: .cloudbuild/configs/release.yaml
+github:
+  owner: einride
+  name: ghcomment
+  push:
+    tag: "^v.*"

.cloudbuild/triggers/review.yaml

@@ -5,4 +5,4 @@ github:
   owner: einride
   name: ghcomment
   push:
-    branch: ".*"
+    branch: ".*"

.gitignore

@@ -0,0 +1,2 @@
+.idea
+github.token

.goreleaser.yml

@@ -0,0 +1,4 @@
+release:
+  github:
+    owner: einride
+    name: ghcomment

Makefile

@@ -10,9 +10,9 @@ go-test:
 
 .PHONY: go-build
 go-build:
-	GOOS=darwin go build ./...
-	GOOS=windows go build ./...
-	GOOS=linux go build ./...
+	GOOS=darwin go build -o /dev/null ./...
+	GOOS=windows go build -o /dev/null ./...
+	GOOS=linux go build -o /dev/null ./...
 
 .PHONY: go-mod-tidy
 go-mod-tidy: