WIP: test(CHANGELOG): add changelog: released entry changed label escape hatch

TODO: check for label in action, plumb option to still succeed?
TODO: test it out
TODO: docs

Author: ErichDonGubler

.github/workflows/changelog.yml

@@ -9,6 +9,8 @@ on:
       - opened
       - synchronize
       - reopened
+      - labeled
+      - unlabeled
 
 env:
   #
@@ -44,5 +46,6 @@ jobs:
       - name: Run `cargo xtask changelog …`
         run: >
           cargo xtask changelog --emit-github-messages
+            ${{ contains(github.event.issue.labels.*.name, 'changelog: released entry changed') && '--warn-only' || ''  }}
             "origin/${{ github.event.pull_request.base.ref }}"
             >> "$GITHUB_STEP_SUMMARY"

xtask/src/changelog.rs

@@ -5,6 +5,7 @@ pub(crate) fn check_changelog(shell: Shell, mut args: Arguments) -> anyhow::Resu
     const CHANGELOG_PATH_RELATIVE: &str = "./CHANGELOG.md";
 
     let emit_github_messages = args.contains("--emit-github-messages");
+    let warn_only = args.contains("--warn-only");
 
     let from_branch = args
         .free_from_str()
@@ -65,10 +66,11 @@ pub(crate) fn check_changelog(shell: Shell, mut args: Arguments) -> anyhow::Resu
             eprintln!("{}", hunk.contents);
 
             if emit_github_messages {
+                let severity = if warn_only { "warning" } else { "error" };
                 let title = "";
                 let message = "";
                 println!(
-                    "::error file={},line={},endLine={},title={title}::{message}",
+                    "::{severity} file={},line={},endLine={},title={title}::{message}",
                     CHANGELOG_PATH_RELATIVE, hunk.change_start_line_num, hunk.change_end_line_num,
                 )
             }
@@ -81,7 +83,12 @@ pub(crate) fn check_changelog(shell: Shell, mut args: Arguments) -> anyhow::Resu
             "one or more checks against `{}` failed; see above for details",
             CHANGELOG_PATH_RELATIVE,
         );
-        Err(anyhow::Error::msg(msg))
+        if warn_only {
+            log::warn!("{msg}");
+            Ok(())
+        } else {
+            Err(anyhow::Error::msg(msg))
+        }
     } else {
         Ok(())
     }