workflows,scripts: add separate workflow job and script to build and publish releases

.github/workflows/create-github-release.yml

@@ -1,36 +0,0 @@
-# New tags and releases are created by changeset https://github.com/atlassian/changesets
-name: Create a new release on GitHub when a new tag is created
-
-on:
-  push:
-    tags:
-      - 'v*' # Push events to matching v*, i.e. v0.4.0, v1.1.0
-
-jobs:
-  build:
-    name: Create a new release on GitHub when a new tag is created
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout code
-        uses: actions/checkout@v2
-
-      - name: use node.js 12.x
-        uses: actions/setup-node@v1
-        with:
-          node-version: '12.x'
-
-      - name: Install node dependencies
-        run: npm install @octokit/rest
-
-      # GITHUB_REF is of the format refs/tags/vA.B.C
-      # This step extracts vA.B.C from GITHUB_REF
-      - name: Get the version
-        id: get_version
-        run: echo "::set-output name=TAG_NAME::${GITHUB_REF#refs/tags/}"
-
-      # TODO/Note: This will only create a Draft release, which the maintainer can see and publish.
-      # If the Draft release looks good, modify the step to go ahead publish the release. (By adding the third CLI argument.)
-      - name: Create release on GitHub
-        run: node scripts/create-github-release.js ${{ steps.get_version.outputs.TAG_NAME }}
-        env:
-          GITHUB_TOKEN: ${{ secrets.GH_SERVICE_ACCOUNT_TOKEN }}

.github/workflows/master.yml

@@ -70,21 +70,6 @@ jobs:
           bash <(curl -s https://codecov.io/bash) -f packages/core/coverage/* -F core
           bash <(curl -s https://codecov.io/bash) -f packages/core-api/coverage/* -F core-api
 
-      # Publishes current version of packages that are not already present in the registry
-      - name: publish
-        if: matrix.node-version == '12.x'
-        run: yarn lerna -- publish from-package --yes
-        env:
-          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
-
-      # Tags the commit with the version in the core package if the tag doesn't exist
-      - uses: Klemensas/action-autotag@1.2.3
-        if: matrix.node-version == '12.x'
-        with:
-          GITHUB_TOKEN: '${{ secrets.GH_SERVICE_ACCOUNT_TOKEN }}'
-          package_root: 'packages/core'
-          tag_prefix: 'v'
-
       - name: Discord notification
         if: ${{ failure() }}
         uses: Ilshidur/action-discord@0.2.0
@@ -92,3 +77,85 @@ jobs:
           DISCORD_WEBHOOK: ${{ secrets.DISCORD_WEBHOOK }}
         with:
           args: 'Master build failed https://github.com/{{GITHUB_REPOSITORY}}/actions/runs/{{GITHUB_RUN_ID}}'
+
+  # A separate release build that is only run for commits that are the result of merging the "Version Packages" PR
+  # We can't re-use the output from the above step, but we'll have a guaranteed node_modules cache and
+  # only run the build steps that are necessary for publishing
+  release:
+    if: ${{ endsWith(github.event.head_commit.message, 'from backstage/changeset-release/master\n\nVersion Packages') }}
+    needs: build
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [14.x]
+
+    env:
+      CI: 'true'
+      NODE_OPTIONS: --max-old-space-size=4096
+
+    steps:
+      - uses: actions/checkout@v2
+
+      # Beginning of yarn setup, keep in sync between all workflows, see ci.yml
+      - name: use node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node-version }}
+          registry-url: https://registry.npmjs.org/ # Needed for auth
+      - name: cache all node_modules
+        id: cache-modules
+        uses: actions/cache@v2
+        with:
+          path: '**/node_modules'
+          key: ${{ runner.os }}-v${{ matrix.node-version }}-node_modules-${{ hashFiles('yarn.lock', '**/package.json') }}
+      - name: find location of global yarn cache
+        id: yarn-cache
+        if: steps.cache-modules.outputs.cache-hit != 'true'
+        run: echo "::set-output name=dir::$(yarn cache dir)"
+      - name: cache global yarn cache
+        uses: actions/cache@v2
+        if: steps.cache-modules.outputs.cache-hit != 'true'
+        with:
+          path: ${{ steps.yarn-cache.outputs.dir }}
+          key: ${{ runner.os }}-yarn-${{ hashFiles('yarn.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-yarn-
+      - name: yarn install
+        run: yarn install --frozen-lockfile
+      # End of yarn setup
+
+      - name: build type declarations
+        run: yarn tsc:full
+
+      - name: build packages
+        run: yarn lerna -- run --ignore example-app build
+
+      # Publishes current version of packages that are not already present in the registry
+      - name: publish
+        run: yarn lerna -- publish from-package --yes
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
+
+      # Creates the next available tag with format "release-<year>-<month>-<day>[.<n>]"
+      - name: Create a release tag
+        id: create_tag
+        run: node scripts/create-release-tag.js
+        env:
+          GITHUB_TOKEN: ${{ secrets.GH_SERVICE_ACCOUNT_TOKEN }}
+
+      # Convert the newly created tag into a release with changelog information
+      - name: Create release on GitHub
+        run: node scripts/create-github-release.js ${{ steps.create_tag.outputs.tag_name }} 1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GH_SERVICE_ACCOUNT_TOKEN }}
+
+      # Notify everyone about this great new release :D
+      - name: Discord notification
+        uses: Ilshidur/action-discord@0.2.0
+        env:
+          DISCORD_WEBHOOK: ${{ secrets.DISCORD_RELEASE_WEBHOOK }}
+          TAG_NAME: ${{ steps.create_tag.outputs.tag_name }}
+        with:
+          args: 'A new release has been published! https://github.com/backstage/backstage/releases/tag/{{TAG_NAME}}'