Display bundle size changes in comments on opened PRs (#1205)

.github/workflows/build.yml

@@ -12,7 +12,6 @@ on:
     branches:
       - master
   pull_request:
-    branches: '*'
 
 jobs:
   api:
@@ -60,27 +59,63 @@ jobs:
         with:
           name: actual-web
           path: packages/desktop-client/build
-
-  electron:
-    # As electron builds take longer, we only run them in master.
-    strategy:
-      matrix:
-        os:
-          - ubuntu-latest
-          - windows-latest
-          - macos-latest
-    runs-on: ${{ matrix.os }}
-    steps:
-      - uses: actions/checkout@v3
-      - name: Set up environment
-        uses: ./.github/actions/setup
-      - name: Build Electron
-        run: ./bin/package-electron
-      - name: Upload Build
+      - name: Upload Build Stats
         uses: actions/upload-artifact@v3
         with:
-          name: actual-electron-${{ matrix.os }}
-          path: |
-            packages/desktop-electron/dist/*.dmg
-            packages/desktop-electron/dist/*.exe
-            packages/desktop-electron/dist/*.AppImage
+          name: build-stats
+          path: packages/desktop-client/build-stats
+
+  size-compare:
+    runs-on: ubuntu-latest
+    needs: [web]
+    if: github.event_name == 'pull_request'
+    permissions:
+      pull-requests: write
+    steps:
+      - name: Wait for ${{github.base_ref}} build to succeed
+        uses: fountainhead/action-wait-for-check@v1.1.0
+        id: master-build
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          checkName: web
+          ref: ${{github.base_ref}}
+
+      - name: Report build failure
+        if: steps.master-build.outputs.conclusion == 'failure'
+        run: |
+          echo "Build failed on ${{github.base_ref}}"
+          exit 1
+
+      - name: Download build artifact from ${{github.base_ref}}
+        uses: dawidd6/action-download-artifact@v2
+        id: pr-build
+        with:
+          branch: ${{github.base_ref}}
+          workflow: build.yml
+          name: build-stats
+          path: base
+
+      - name: Download build artifact from PR
+        uses: actions/download-artifact@v2
+        with:
+          name: build-stats
+          path: head
+
+      - name: Strip content hashes from stats files
+        run: |
+          sed -i -E 's/\.[0-9a-f]{8,}\././g' ./head/*.json
+          sed -i -E 's/\.[0-9a-f]{8,}\././g' ./base/*.json
+
+      - uses: github/webpack-bundlesize-compare-action@v1.8.1
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          current-stats-json-path: ./head/desktop-client-stats.json
+          base-stats-json-path: ./base/desktop-client-stats.json
+          title: desktop-client
+
+      - uses: github/webpack-bundlesize-compare-action@v1.8.1
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          current-stats-json-path: ./head/loot-core-stats.json
+          base-stats-json-path: ./base/loot-core-stats.json
+          title: loot-core