feat(e2e): add support running behind proxy (#5348)

* docs: update maintaining

* chore(e2e): add maxFailures to playwright

* fix(ci): skip submodule in e2e job

We don't need the submodules for the e2e job. This will speed up the
checkout step.

* feat(ci): add test-e2e-proxy job

This adds a new job to CI to run our tests behind Caddy and simulate
code-server running against a reverse-proxy.

* refactor: make e2e work with reverse proxy

This refactors the e2e test in a couple ways:
- remove setting cookie in localStorage (instead we pass --auth none)
- refactor address() method to account for reverse proxy logic

* Update test/e2e/models/CodeServer.ts

* Update test/playwright.config.ts

* Update test/utils/constants.ts

Co-authored-by: Asher <ash@coder.com>

* Update test/utils/helpers.ts

Co-authored-by: Asher <ash@coder.com>

Co-authored-by: Asher <ash@coder.com>

.github/workflows/ci.yaml

@@ -461,7 +461,6 @@ jobs:
         uses: actions/checkout@v3
         with:
           fetch-depth: 0
-          submodules: true
 
       - name: Install Node.js v16
         uses: actions/setup-node@v3
@@ -491,7 +490,7 @@ jobs:
 
       - name: Install dependencies
         if: steps.cache-yarn.outputs.cache-hit != 'true'
-        run: yarn --frozen-lockfile
+        run: SKIP_SUBMODULE_DEPS=1 yarn --frozen-lockfile
 
       - name: Install Playwright OS dependencies
         run: |
@@ -511,6 +510,93 @@ jobs:
       - name: Remove release packages and test artifacts
         run: rm -rf ./release-packages ./test/test-results
 
+  test-e2e-proxy:
+    name: End-to-end tests behind proxy
+    needs: package-linux-amd64
+    runs-on: ubuntu-latest
+    timeout-minutes: 25
+    env:
+      # Since we build code-server we might as well run tests from the release
+      # since VS Code will load faster due to the bundling.
+      CODE_SERVER_TEST_ENTRY: "./release-packages/code-server-linux-amd64"
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - name: Install Node.js v16
+        uses: actions/setup-node@v3
+        with:
+          node-version: "16"
+
+      - name: Fetch dependencies from cache
+        id: cache-yarn
+        uses: actions/cache@v3
+        with:
+          path: "**/node_modules"
+          key: yarn-build-${{ hashFiles('**/yarn.lock') }}
+          restore-keys: |
+            yarn-build-
+
+      - name: Download release packages
+        uses: actions/download-artifact@v3
+        with:
+          name: release-packages
+          path: ./release-packages
+
+      - name: Untar code-server release
+        run: |
+          cd release-packages
+          tar -xzf code-server*-linux-amd64.tar.gz
+          mv code-server*-linux-amd64 code-server-linux-amd64
+
+      - name: Install dependencies
+        if: steps.cache-yarn.outputs.cache-hit != 'true'
+        run: SKIP_SUBMODULE_DEPS=1 yarn --frozen-lockfile
+
+      - name: Install Playwright OS dependencies
+        run: |
+          ./test/node_modules/.bin/playwright install-deps
+          ./test/node_modules/.bin/playwright install
+
+      - name: Cache Caddy
+        uses: actions/cache@v2
+        id: caddy-cache
+        with:
+          path: |
+            ~/.cache/caddy
+          key: cache-caddy-2.5.2
+
+      - name: Install Caddy
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        if: steps.caddy-cache.outputs.cache-hit != 'true'
+        run: |
+          gh release download v2.5.2 --repo caddyserver/caddy --pattern "caddy_2.5.2_linux_amd64.tar.gz"
+          mkdir -p ~/.cache/caddy 
+          tar -xzf caddy_2.5.2_linux_amd64.tar.gz --directory ~/.cache/caddy
+
+      - name: Start Caddy
+        run: sudo ~/.cache/caddy/caddy start --config ./ci/Caddyfile
+
+      - name: Run end-to-end tests
+        run: yarn test:e2e:proxy
+
+      - name: Stop Caddy
+        if: always()
+        run: sudo ~/.cache/caddy/caddy stop --config ./ci/Caddyfile
+
+      - name: Upload test artifacts
+        if: always()
+        uses: actions/upload-artifact@v3
+        with:
+          name: failed-test-videos-proxy
+          path: ./test/test-results
+
+      - name: Remove release packages and test artifacts
+        run: rm -rf ./release-packages ./test/test-results
+
   trivy-scan-repo:
     permissions:
       contents: read # for actions/checkout to fetch code