ci: Update workflows/scripts for deploying collab to use clang (#51224)

Release Notes:

- N/A

.github/workflows/deploy_collab.yml

@@ -12,6 +12,9 @@ jobs:
     if: (github.repository_owner == 'zed-industries' || github.repository_owner == 'zed-extensions')
     name: Check formatting and Clippy lints
     runs-on: namespace-profile-16x32-ubuntu-2204
+    env:
+      CC: clang
+      CXX: clang++
     steps:
     - name: steps::checkout_repo
       uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
@@ -42,6 +45,9 @@ jobs:
     - style
     name: Run tests
     runs-on: namespace-profile-16x32-ubuntu-2204
+    env:
+      CC: clang
+      CXX: clang++
     steps:
     - name: steps::checkout_repo
       uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683

Dockerfile-collab

@@ -14,8 +14,12 @@ ARG GITHUB_SHA
 ENV GITHUB_SHA=$GITHUB_SHA
 
 # Also add `cmake`, since we need it to build `wasmtime`.
+# clang is needed because `webrtc-sys` uses Clang-specific compiler flags.
 RUN apt-get update; \
-    apt-get install -y --no-install-recommends cmake
+    apt-get install -y --no-install-recommends cmake clang
+
+ENV CC=clang
+ENV CXX=clang++
 
 RUN --mount=type=cache,target=./script/node_modules \
     --mount=type=cache,target=/usr/local/cargo/registry \

tooling/xtask/src/tasks/workflows/deploy_collab.rs

@@ -3,7 +3,7 @@ use indoc::indoc;
 
 use crate::tasks::workflows::runners::{self, Platform};
 use crate::tasks::workflows::steps::{
-    self, CommonJobConditions, FluentBuilder as _, NamedJob, dependant_job, named,
+    self, CommonJobConditions, FluentBuilder as _, NamedJob, dependant_job, named, use_clang,
 };
 use crate::tasks::workflows::vars;
 
@@ -23,7 +23,7 @@ pub(crate) fn deploy_collab() -> Workflow {
 }
 
 fn style() -> NamedJob {
-    named::job(
+    named::job(use_clang(
         dependant_job(&[])
             .name("Check formatting and Clippy lints")
             .with_repository_owner_guard()
@@ -34,7 +34,7 @@ fn style() -> NamedJob {
             .map(steps::install_linux_dependencies)
             .add_step(steps::cargo_fmt())
             .add_step(steps::clippy(Platform::Linux)),
-    )
+    ))
 }
 
 fn tests(deps: &[&NamedJob]) -> NamedJob {
@@ -42,7 +42,7 @@ fn tests(deps: &[&NamedJob]) -> NamedJob {
         named::bash("cargo nextest run --package collab --no-fail-fast")
     }
 
-    named::job(
+    named::job(use_clang(
         dependant_job(deps)
             .name("Run tests")
             .runs_on(runners::LINUX_XL)
@@ -65,7 +65,7 @@ fn tests(deps: &[&NamedJob]) -> NamedJob {
             .add_step(steps::cargo_install_nextest())
             .add_step(steps::clear_target_dir_if_large(Platform::Linux))
             .add_step(run_collab_tests()),
-    )
+    ))
 }
 
 fn publish(deps: &[&NamedJob]) -> NamedJob {