Run bootstrap-gstreamer in CI

etc/taskcluster/decision_task.py

@@ -184,6 +184,7 @@ def linux_tidy_unit_untrusted():
         .with_script("""
             ./mach test-tidy --no-progress --all
             ./mach test-tidy --no-progress --self-test
+            ./mach bootstrap-gstreamer
             ./mach build --dev
             ./mach test-unit
 
@@ -817,7 +818,10 @@ def linux_build_task(name, *, build_env=build_env, install_rustc_dev=True):
         .with_dockerfile(dockerfile_path("build"))
         .with_env(**build_env, **unix_build_env, **linux_build_env)
         .with_repo_bundle()
-        .with_script("rustup set profile minimal")
+        .with_script("""
+            rustup set profile minimal
+            ./mach bootstrap-gstreamer
+        """)
     )
     if install_rustc_dev:
         # required by components/script_plugins: