ci: add codespell job

Also, fix a typo found in RELEASES.md.

Signed-off-by: Kir Kolyshkin <[email protected]>

Author: kolyshkin

.github/workflows/validate.yml

@@ -49,3 +49,13 @@ jobs:
         run: |
           go fix ./...
           git diff --exit-code
+
+  codespell:
+    runs-on: ubuntu-24.04
+    steps:
+    - uses: actions/checkout@v4
+    - name: install deps
+      # Use a known version of codespell.
+      run: pip install --break-system-packages codespell==v2.4.1
+    - name: run codespell
+      run: codespell

RELEASES.md

@@ -23,7 +23,7 @@ However, specification releases have special restrictions in the [OCI charter][c
 * They are the target of backwards compatibility (§7.g), and
 * They are subject to the OFWa patent grant (§8.d and e).
 
-To avoid unfortunate side effects (onerous backwards compatibity requirements or Member resignations), the following additional procedures apply to specification releases:
+To avoid unfortunate side effects (onerous backwards compatibility requirements or Member resignations), the following additional procedures apply to specification releases:
 
 ### Planning a release