ci: Run check_docs when code changes (#43188)

Closes #ISSUE

Release Notes:

- N/A *or* Added/Fixed/Improved ...

tooling/xtask/src/tasks/workflows.rs

@@ -23,6 +23,9 @@ mod vars;
 pub struct GenerateWorkflowArgs {}
 
 pub fn run_workflows(_: GenerateWorkflowArgs) -> Result<()> {
+    if !Path::new("crates/zed/").is_dir() {
+        anyhow::bail!("xtask workflows must be ran from the project root");
+    }
     let dir = Path::new(".github/workflows");
 
     let workflows = vec![

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

@@ -25,7 +25,7 @@ pub(crate) fn run_tests() -> Workflow {
         "run_tests",
         r"^(docs/|script/update_top_ranking_issues/|\.github/(ISSUE_TEMPLATE|workflows/(?!run_tests)))",
     );
-    let should_check_docs = PathCondition::new("run_docs", r"^docs/");
+    let should_check_docs = PathCondition::new("run_docs", r"^(docs/|crates/.*\.rs)");
     let should_check_scripts = PathCondition::new(
         "run_action_checks",
         r"^\.github/(workflows/|actions/|actionlint.yml)|tooling/xtask|script/",