ci: allow release-please to be run on demand (#3)

release-please is silent when there is nothing to release, which is
indistinguishable from it being misconfigured. Adding workflow_dispatch makes
that state checkable without pushing a commit.

Co-authored-by: Maurice Schmicking <maurice.schmicking@gmail.com>
Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

Author: mschmicking

.github/workflows/release-please.yml

@@ -10,6 +10,10 @@ name: Release PR
 on:
   push:
     branches: [master]
+  # Lets a run be forced without pushing. Useful because release-please is silent by
+  # design when there is nothing to release — dispatching it and reading the log is
+  # the only way to tell "working, nothing to do" apart from "misconfigured".
+  workflow_dispatch:
 
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   contents: write