feat(build): github status jobs

.gitlab-ci.yml

@@ -1,6 +1,8 @@
 stages:
+  - status-pre
   - build
   - image
+  - status-post
 
 build-go:
   stage: build
@@ -48,3 +50,27 @@ build-image:
   variables:
     DOCKER_DRIVER: overlay2
     DOCKER_HOST: tcp://localhost:237
+
+
+github-pending:
+  stage: status-pre
+  extends:
+    - .build-base
+  script:
+    - ./scripts/github-status.sh pending
+
+github-failure:
+  stage: status-post
+  extends:
+    - .build-base
+  when: on_failure
+  script:
+    - ./scripts/github-status.sh failure
+
+github-success:
+  stage: status-post
+  extends:
+    - .build-base
+  when: on_success
+  script:
+    - ./scripts/github-status.sh success

scripts/github-status.sh

@@ -0,0 +1,19 @@
+#! /bin/sh
+
+STATUS="${1}"
+CI_COMMIT_SHA="${CI_COMMIT_SHA:-$(git rev-parse HEAD)}"
+
+STATUS_BODY="$(cat <<EOF
+{
+  "state": "${STATUS}",
+  "target_url": "${CI_PIPELINE_URL}",
+  "description": "CI pipeline ${STATUS}!",
+  "context": "gitlab/build"
+}
+EOF
+)"
+
+printf "Reporting status for %s...\n%s" "${CI_COMMIT_SHA}" "${STATUS_BODY}"
+printf "%s" "${STATUS_BODY}" | curl -d @- \
+  -H "Authorization: token $(printf "%s" "${GITHUB_SECRET}" | base64 -d)" \
+  -i "https://api.github.com/repos/${CI_PROJECT_PATH}/statuses/${CI_COMMIT_SHA}"