Generator: run manifest step on partial arch success (oleks/ci-scripts#9)

generator/templates/matrix/manifest.yaml.tmpl

@@ -5,6 +5,17 @@ when:
 depends_on:
   - build
 
+# oleks/ci-scripts#9: run even if a per-arch matrix leg failed. Without
+# `runs_on`, Woodpecker skips a dependent workflow outright once any leg of
+# `build` fails, so a lone arm64 success would silently produce no image at
+# all. `{script} --manifest` itself must probe the registry for which
+# per-arch tags actually landed (not assume a fixed arch list, and not rely
+# on step/pipeline success status) and build the manifest from whatever
+# exists — a partial manifest beats none.
+runs_on:
+  - success
+  - failure
+
 # Thin wrapper (cluster #196, emmett#44): the SAME {script} composes the
 # per-arch tags into the multi-arch :<version> + :latest manifest list.
 # PUBLISH=1 is the only CI-specific override (local default is dry-run).