ci: Install chromium for VHS testing

Vhs installs chromium for testing, but it may slow downs things a bit if
done during tests (as it may be repeated), while doing it once here
avoids such issue

.github/workflows/qa.yaml

@@ -170,6 +170,10 @@ jobs:
           chmod +x ttyd.x86_64
           sudo mv ttyd.x86_64 /usr/bin/ttyd
 
+      - name: Install Chromium for VHS tests
+        # It's used by vhs, installing it once speeds up tests.
+        uses: browser-actions/setup-chrome@v1
+
       - name: Install rust
         if: matrix.test != 'asan'
         uses: actions-rs/toolchain@v1
@@ -195,6 +199,7 @@ jobs:
         if: matrix.test == 'coverage'
         env:
           G_DEBUG: "fatal-criticals"
+          VHS_NO_SANDBOX: 1
         run: |
           set -euo pipefail
 
@@ -229,6 +234,7 @@ jobs:
         if: matrix.test == 'race'
         env:
           GO_TESTS_TIMEOUT: 35m
+          VHS_NO_SANDBOX: 1
         run: |
           go test -json -timeout ${GO_TESTS_TIMEOUT} -race ./... | \
             gotestfmt --logfile "${AUTHD_TEST_ARTIFACTS_PATH}/gotestfmt.race.log"
@@ -243,6 +249,7 @@ jobs:
           GO_TESTS_TIMEOUT: 30m
           # Use these flags to give ASAN a better time to unwind the stack trace
           GO_GC_FLAGS: -N -l
+          VHS_NO_SANDBOX: 1
         run: |
           # Print executed commands to ease debugging
           set -x