fix missing shellcheck in pre-commit image (#497)

Signed-off-by: carlory <[email protected]>

Author: carlory

Dockerfile.precommit

@@ -30,5 +30,8 @@ RUN pip install --break-system-packages yamllint
 # CodeSpell
 RUN pip install --break-system-packages codespell
 
+# Shellcheck
+RUN pip install --break-system-packages shellcheck-py
+
 # Golangci-lint
 RUN curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/HEAD/install.sh | sh -s -- -b $(go env GOPATH)/bin v2.5.0