docs: update actions and workflows documentation

[skip ci]

Signed-off-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: github-actions[bot]

actions/helm/release-chart/README.md

@@ -16,7 +16,9 @@
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-Action to release a Helm chart to OCI registry
+Action to release a Helm chart to OCI registry.
+Supports umbrella charts: if a chart has local dependencies having version 0.0.0,
+the action will update those dependencies version with the given tag, then update the Chart.lock accordingly.
 
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