Add new workflow

.github/workflows/check-release.yaml

@@ -0,0 +1,40 @@
+name: Check Release
+
+on:
+  pull_request:
+    types:
+      - labeled
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: actions-ecosystem/action-release-label@v1
+        id: release-label
+        if: ${{ startsWith(github.event.label.name, 'release/') }}
+
+      - uses: actions-ecosystem/action-get-latest-tag@v1
+        id: get-latest-tag
+        if: ${{ steps.release-label.outputs.level != null }}
+        with:
+          semver_only: true
+
+      - uses: actions-ecosystem/action-bump-semver@v1
+        id: bump-semver
+        if: ${{ steps.release-label.outputs.level != null }}
+        with:
+          current_version: ${{ steps.get-latest-tag.outputs.tag }}
+          level: ${{ steps.release-label.outputs.level }}
+
+      - uses: actions-ecosystem/action-create-comment@v1
+        if: ${{ steps.bump-semver.outputs.new_version != null }}
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          body: |
+            This PR will update [${{ github.repository }}](https://github.com/${{ github.repository }}) from [${{ steps.get-latest-tag.outputs.tag }}](https://github.com/${{ github.repository }}/releases/tag/${{ steps.get-latest-tag.outputs.tag }}) to **${{ steps.bump-semver.outputs.new_version }}** :rocket:
+
+            Changes: https://github.com/${{ github.repository }}/compare/${{ steps.get-latest-tag.outputs.tag }}...${{ github.event.pull_request.head.ref }}
+
+            If this update isn't as you expected, you may want to change or remove the *release label*.

.github/workflows/release.yaml

@@ -1,22 +1,84 @@
-name: release
+name: Release
+
 on:
   push:
-    tags:
-    - "v[0-9]+.[0-9]+.[0-9]+"
+    branches:
+      - main
+      - master
+
 jobs:
-  goreleaser:
+  release:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v1
-      - name: Setup Go
-        uses: actions/setup-go@v1
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - name: Set up Go
+        uses: actions/setup-go@v2
         with:
           go-version: 1.16.1
-      - name: Run GoReleaser
-        uses: goreleaser/goreleaser-action@v1
+
+      - name: Cache Go modules
+        uses: actions/cache@v2
+        with:
+          path: ~/go/pkg/mod
+          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+          restore-keys: |
+            ${{ runner.os }}-go-
+
+      - name: Get pull request
+        uses: actions-ecosystem/action-get-merged-pull-request@v1
+        id: get-merged-pull-request
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Get release label
+        uses: actions-ecosystem/action-release-label@v1
+        id: release-label
+        if: ${{ steps.get-merged-pull-request.outputs.title != null }}
+        with:
+          labels: ${{ steps.get-merged-pull-request.outputs.labels }}
+
+      - name: Get latest Git tag
+        uses: actions-ecosystem/action-get-latest-tag@v1
+        id: get-latest-tag
+        if: ${{ steps.release-label.outputs.level != null }}
+        with:
+          semver_only: true
+
+      - name: Bump up version
+        uses: actions-ecosystem/action-bump-semver@v1
+        id: bump-semver
+        if: ${{ steps.release-label.outputs.level != null }}
+        with:
+          current_version: ${{ steps.get-latest-tag.outputs.tag }}
+          level: ${{ steps.release-label.outputs.level }}
+
+      - name: Push new Git tag
+        uses: actions-ecosystem/action-push-tag@v1
+        if: ${{ steps.bump-semver.outputs.new_version != null }}
+        with:
+          tag: ${{ steps.bump-semver.outputs.new_version }}
+          message: "${{ steps.bump-semver.outputs.new_version }}: PR #${{ steps.get-merged-pull-request.outputs.number }} ${{ steps.get-merged-pull-request.outputs.title }}"
+
+      - name: Release binaries with GoReleaser
+        uses: goreleaser/goreleaser-action@v2
+        if: ${{ steps.release-label.outputs.level == 'major' || steps.release-label.outputs.level == 'minor' || steps.release-label.outputs.level == 'patch' }}
         with:
           version: latest
           args: release --rm-dist
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Post release comment
+        uses: actions-ecosystem/action-create-comment@v1
+        if: ${{ steps.bump-semver.outputs.new_version != null }}
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          number: ${{ steps.get-merged-pull-request.outputs.number }}
+          body: |
+            The new version [${{ steps.bump-semver.outputs.new_version }}](https://github.com/${{ github.repository }}/releases/tag/${{ steps.bump-semver.outputs.new_version }}) has been released :tada:
+
+            Changes: https://github.com/${{ github.repository }}/compare/${{ steps.get-latest-tag.outputs.tag }}...${{ steps.bump-semver.outputs.new_version }}