ci: use Ubuntu 22.04 for nightly jobs

The upstream PR (web-platform-tests/wpt#51084) to update the WPT.fyi
docker image to 22.04 landed few days back. No new issues have been
discovered so far in wpt.fyi, so it should be safe for us to move to
22.04 for the nightly builds (other linux jobs already use 22.04).

Fixes servo#35747.

Signed-off-by: Mukilan Thiyagarajan <[email protected]>

Author: mukilan

.github/workflows/linux.yml

@@ -90,10 +90,10 @@ jobs:
     uses: ./.github/workflows/self-hosted-runner-select.yml
     secrets: inherit
     with:
-      # Ubuntu 22.04 has glibc 2.34 so the binaries produced
-      # won't run on systems with older glibc e.g wpt.fyi
-      # runners which still use 20.04.
-      github-hosted-runner-label: ubuntu-${{ inputs.upload && '20.04' || '22.04' }}
+      # Before updating the GH action runner image for the nightly job, ensure
+      # that the system has a glibc version that is compatible with the one
+      # used by the wpt.fyi runners.
+      github-hosted-runner-label: ubuntu-22.04
       self-hosted-image-name: servo-ubuntu2204
       force-github-hosted-runner: ${{ inputs.upload || inputs.force-github-hosted-runner }}
   runner-timeout:
@@ -139,15 +139,13 @@ jobs:
           large-packages: false
           swap-storage: false
       - name: Install LLVM and Clang
-        # Expliclity install Clang 14 on Ubuntu 20.04 used by the nightly job (#34713).
-        if: ${{ runner.environment != 'self-hosted' && inputs.upload }}
+        # Expliclity install Clang 14
+        if: ${{ runner.environment != 'self-hosted' }}
         uses: KyleMayes/install-llvm-action@v2
         with:
           version: 14
-        # FIXME: It would be better to use the above step for regular Linux jobs
-        # and remove the following step, but currenty that is failing and needs investigation.
       - name: Set LIBCLANG_PATH env # needed for bindgen in mozangle
-        if: ${{ runner.environment != 'self-hosted' && !inputs.upload }} # not needed on ubuntu 20.04 used for nightly
+        if: ${{ runner.environment != 'self-hosted' }}
         run: echo "LIBCLANG_PATH=/usr/lib/llvm-14/lib" >> $GITHUB_ENV
       - name: Setup Python
         if: ${{ runner.environment != 'self-hosted' }}