Set up a layered build for CI similar to what EW does

.github/workflows/build-element-call.yaml

@@ -14,6 +14,11 @@ on:
         description: The build mode for vite. Must be either 'development' or 'production'
         required: false
         default: production
+      layered:
+        type: boolean
+        description: Build against the matching branch of matrix-js-sdk (if any) instead of the locked commit.
+        required: false
+        default: false
     secrets:
       SENTRY_ORG:
         required: true
@@ -43,8 +48,15 @@ jobs:
           cache: "pnpm"
           node-version-file: ".node-version"
       - name: Install dependencies
+        if: ${{ !inputs.layered }}
         # ignore-pnpmfile should never be commited. Make CI crash if it happened (`pnpmfileChecksum` is present)
         run: "pnpm install --frozen-lockfile --ignore-pnpmfile"
+      - name: Install dependencies (layered)
+        if: ${{ inputs.layered }}
+        # ignore-pnpmfile should never be commited. Make CI crash if it happened (`pnpmfileChecksum` is present)
+        run: "scripts/layered.sh --ignore-pnpmfile"
+        env:
+          PR_HEAD_REPO_OWNER: ${{ github.event.pull_request.head.repo.owner.login }}
       - name: Build Element Call
         run: pnpm run build:"$PACKAGE":"$BUILD_MODE"
         env:

.github/workflows/build.yaml

@@ -15,6 +15,7 @@ jobs:
       package: full
       vite_app_version: ${{ github.event.release.tag_name || github.sha }}
       build_mode: ${{ github.event_name == 'pull_request' && contains(github.event.pull_request.labels.*.name, 'development build') && 'development' || 'production' }}
+      layered: ${{ github.event_name == 'pull_request' }}
     secrets:
       SENTRY_ORG: ${{ secrets.SENTRY_ORG }}
       SENTRY_PROJECT: ${{ secrets.SENTRY_PROJECT }}
@@ -65,6 +66,7 @@ jobs:
       package: embedded
       vite_app_version: ${{ github.event.release.tag_name || github.sha }}
       build_mode: ${{ github.event_name == 'pull_request' && contains(github.event.pull_request.labels.*.name, 'development build') && 'development' || 'production' }}
+      layered: ${{ github.event_name == 'pull_request' }}
     secrets:
       SENTRY_ORG: ${{ secrets.SENTRY_ORG }}
       SENTRY_PROJECT: ${{ secrets.SENTRY_PROJECT }}
@@ -79,6 +81,7 @@ jobs:
       package: sdk
       vite_app_version: ${{ github.event.release.tag_name || github.sha }}
       build_mode: ${{ github.event_name == 'pull_request' && contains(github.event.pull_request.labels.*.name, 'development build') && 'development' || 'production' }}
+      layered: ${{ github.event_name == 'pull_request' }}
     secrets:
       SENTRY_ORG: ${{ secrets.SENTRY_ORG }}
       SENTRY_PROJECT: ${{ secrets.SENTRY_PROJECT }}

.github/workflows/lint.yaml

@@ -17,9 +17,11 @@ jobs:
         with:
           cache: "pnpm"
           node-version-file: ".node-version"
-      - name: Install dependencies
+      - name: Install dependencies (layered)
         # ignore-pnpmfile should never be commited. Make CI crash if it happened (`pnpmfileChecksum` is present)
-        run: "pnpm install --frozen-lockfile --ignore-pnpmfile"
+        run: "scripts/layered.sh --ignore-pnpmfile"
+        env:
+          PR_HEAD_REPO_OWNER: ${{ github.event.pull_request.head.repo.owner.login }}
       - name: Formatting
         run: "pnpm run format:check"
       - name: i18n

.github/workflows/test.yaml

@@ -20,8 +20,15 @@ jobs:
           cache: "pnpm"
           node-version-file: ".node-version"
       - name: Install dependencies
+        if: github.event_name != 'pull_request'
         # ignore-pnpmfile should never be commited. Make CI crash if it happened (`pnpmfileChecksum` is present)
         run: "pnpm install --frozen-lockfile --ignore-pnpmfile"
+      - name: Install dependencies (layered)
+        if: github.event_name == 'pull_request'
+        # ignore-pnpmfile should never be commited. Make CI crash if it happened (`pnpmfileChecksum` is present)
+        run: "scripts/layered.sh --ignore-pnpmfile"
+        env:
+          PR_HEAD_REPO_OWNER: ${{ github.event.pull_request.head.repo.owner.login }}
       - name: Get Playwright version
         run: echo "PLAYWRIGHT_VERSION=$(pnpm list @playwright/test --depth=0 --json | jq -r '.[0].devDependencies["@playwright/test"].version')" >> $GITHUB_ENV
       - name: Cache Playwright binaries
@@ -58,8 +65,14 @@ jobs:
           cache: "pnpm"
           node-version-file: ".node-version"
       - name: Install dependencies
+        if: github.event_name != 'pull_request'
         # ignore-pnpmfile should never be commited. Make CI crash if it happened (`pnpmfileChecksum` is present)
         run: pnpm install --frozen-lockfile --ignore-pnpmfile
+      - name: Install dependencies (layered)
+        if: github.event_name == 'pull_request'
+        run: scripts/layered.sh --ignore-pnpmfile
+        env:
+          PR_HEAD_REPO_OWNER: ${{ github.event.pull_request.head.repo.owner.login }}
       - name: Get Playwright version
         run: echo "PLAYWRIGHT_VERSION=$(pnpm list @playwright/test --depth=0 --json | jq -r '.[0].devDependencies["@playwright/test"].version')" >> $GITHUB_ENV
       - name: Cache Playwright binaries