ci: use pnpm lockfile for node setup and installs

Author: gildesmarais

.github/workflows/ci.yml

@@ -58,11 +58,14 @@ jobs:
         uses: actions/setup-node@v6
         with:
           node-version-file: ".tool-versions"
-          cache: npm
-          cache-dependency-path: frontend/package-lock.json
+          cache: pnpm
+          cache-dependency-path: frontend/pnpm-lock.yaml
+
+      - name: Enable Corepack
+        run: corepack enable
 
       - name: Install frontend dependencies for OpenAPI client verification
-        run: npm ci
+        run: pnpm install --frozen-lockfile
         working-directory: frontend
 
       - name: Verify generated OpenAPI spec and client are up to date
@@ -83,32 +86,35 @@ jobs:
         uses: actions/setup-node@v6
         with:
           node-version-file: ".tool-versions"
-          cache: npm
-          cache-dependency-path: frontend/package-lock.json
+          cache: pnpm
+          cache-dependency-path: frontend/pnpm-lock.yaml
+
+      - name: Enable Corepack
+        run: corepack enable
 
       - name: Install dependencies
-        run: npm ci
+        run: pnpm install --frozen-lockfile
 
       - name: Typecheck frontend
-        run: npm run typecheck
+        run: pnpm run typecheck
 
       - name: Lint CSS with Stylelint
         run: pnpm dlx stylelint "**/*.css" || npx stylelint "**/*.css"
 
       - name: Check formatting
-        run: npm run format:check
+        run: pnpm run format:check
 
       - name: Audit dependencies
         run: npm audit --audit-level=moderate
 
       - name: Run frontend tests
-        run: npm run test:ci
+        run: pnpm run test:ci
 
       - name: Install Playwright Chromium
-        run: npx playwright install --with-deps chromium
+        run: pnpm exec playwright install --with-deps chromium
 
       - name: Run frontend smoke test
-        run: npm run test:e2e
+        run: pnpm run test:e2e
 
   docker-build-smoke-image:
     needs:
@@ -182,15 +188,18 @@ jobs:
         uses: actions/setup-node@v6
         with:
           node-version-file: ".tool-versions"
-          cache: npm
-          cache-dependency-path: frontend/package-lock.json
+          cache: pnpm
+          cache-dependency-path: frontend/pnpm-lock.yaml
+
+      - name: Enable Corepack
+        run: corepack enable
 
       - name: Install frontend dependencies
-        run: npm ci
+        run: pnpm install --frozen-lockfile
         working-directory: frontend
 
       - name: Build frontend static assets
-        run: npm run build
+        run: pnpm run build
         working-directory: frontend
 
       - name: Set up QEMU