ci(primitives): run less often, run on pull requests

.github/workflows/update-color-primitives.yml

@@ -1,21 +1,30 @@
 name: Get/Update Primer Color Primitives
 
 env:
-  _DEST_DIR: "${{ github.workspace }}/lua/github-theme/palette/primitives"
-  _JSON_DIR: "${{ github.workspace }}/node_modules/@primer/primitives/dist/json/colors"
-  _LICENSE_GLOB: "${{ github.workspace }}/node_modules/@primer/primitives/[Ll][Ii][Cc][Ee][Nn][Ss][Ee]*"
-  _PRIMITIVES_PKGJSON: "${{ github.workspace }}/node_modules/@primer/primitives/package.json"
+  _DEST_DIR: '${{ github.workspace }}/lua/github-theme/palette/primitives'
+  _JSON_DIR: '${{ github.workspace }}/node_modules/@primer/primitives/dist/json/colors'
+  _LICENSE_GLOB: '${{ github.workspace }}/node_modules/@primer/primitives/[Ll][Ii][Cc][Ee][Nn][Ss][Ee]*'
+  _PRIMITIVES_PKGJSON: '${{ github.workspace }}/node_modules/@primer/primitives/package.json'
 
 on:
   workflow_dispatch:
   schedule:
-    # 3x per week (every other day) at 12:40pm Pacific Time
-    - cron: "40 19 * * 1,3,5"
+    - cron: '40 19 */14 * *' # Roughly every 14 days (at 12:40pm Pacific Time)
+  push:
+    branches:
+      - '**' # Any branch, but ignore tag pushes
+    paths:
+      - .github/workflows/**/*
+      - scripts/**/*
+  pull_request:
+    paths:
+      - .github/workflows/**/*
+      - scripts/**/*
 
 jobs:
   get-colors:
     runs-on: ubuntu-latest
-    permissions:
+    permissions: # NOTE: `write` is not applied for PR's from forks
       checks: write
       contents: write
       issues: write
@@ -28,12 +37,13 @@ jobs:
 
       - uses: actions/setup-node@v4
         with:
-          node-version: "lts/*"
+          node-version: lts/*
           check-latest: true
 
       - run: npm i @primer/primitives@latest
 
-      - run: |
+      - name: Generate Lua files
+        run: |
           set -u +f
           shopt -s nocaseglob failglob
           license="$(<$_LICENSE_GLOB)"
@@ -56,15 +66,38 @@ jobs:
           EOF
           done
 
-      - uses: JohnnyMorganz/stylua-action@v4
+      - name: Check formatting (stylua)
+        uses: JohnnyMorganz/stylua-action@v4
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           version: latest
           args: -f stylua.toml --verify -- ${{ env._DEST_DIR }}
 
-      - uses: peter-evans/create-pull-request@v6
+      - id: diff
+        run: git diff --quiet -- "$_DEST_DIR" || echo has_diff=true >> "$GITHUB_OUTPUT"
+
+      - if: ${{ steps.diff.outputs.has_diff }}
+        uses: actions/upload-artifact@v4
+        with:
+          name: primitives
+          path: ${{ env._DEST_DIR }}
+          retention-days: ${{ (github.event_name != 'push' || github.ref_name != 'main') && 14 || null }}
+          if-no-files-found: error
+          overwrite: true
+
+      - if: ${{ github.event_name == 'push' || github.event_name == 'schedule' }}
+        uses: peter-evans/create-pull-request@v6
         with:
-          commit-message: Update color primitives
-          branch: update-color-primitives
           delete-branch: true
-          title: Update color primitives
+          branch: generated/primitives/${{ github.ref_name }}
+          commit-message: 'deps: update color primitives'
+          title: 'deps: update color primitives'
+          body: |
+            |                   |                          |
+            | ----------------- | ------------------------ |
+            | **Trigger**       | ${{ github.event_name }} |
+            | **Target Branch** | ${{ github.ref_name }}   |
+
+            > [!NOTE]
+            > Checks are not automatically run for this PR.
+            > Close and reopen this PR to run tests and checks (against the newly generated primitives).