document DIST_TRY_BUILD

Author: lqd

src/ci/github-actions/jobs.yml

@@ -61,6 +61,12 @@ envs:
 
   try:
     <<: *production
+    # The following env var activates faster `try` builds in `opt-dist` by, e.g.
+    # - building only the more commonly useful components (we rarely need e.g. rust-docs in try
+    #   builds)
+    # - not running `opt-dist`'s post-optimization smoke tests on the resulting toolchain
+    #
+    # If you *want* these to happen however, temporarily uncomment it before triggering a try build.
     DIST_TRY_BUILD: 1
 
   auto: