chore(e2e): install firefox

.github/workflows/e2e.yml

@@ -33,7 +33,7 @@ jobs:
           cache: "pnpm"
           cache-dependency-path: pnpm-lock.yaml
       - name: Install dependencies
-        run: pnpm install
+        run: pnpm install --filter e2e --frozen-lockfile
       - name: Install Cypress binary
         run: cd ./e2e && pnpm exec cypress install
       - name: Start DB and ZITADEL
@@ -51,7 +51,7 @@ jobs:
           working-directory: e2e
           browser: ${{ matrix.browser }}
           config-file: cypress.config.ts
-          install: false
+          install: ${{ matrix.browser == 'firefox' }}
       - uses: actions/upload-artifact@v4
         if: always()
         with: