[CI/Build] Add linting for github actions workflows (#7876)

Signed-off-by: Russell Bryant <rbryant@redhat.com>

tools/actionlint.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+if command -v actionlint &> /dev/null; then
+    actionlint "$@"
+    exit 0
+elif [ -x ./actionlint ]; then
+    ./actionlint "$@"
+    exit 0
+fi
+
+# download a binary to the current directory - v1.7.3
+bash <(curl https://raw.githubusercontent.com/rhysd/actionlint/aa0a7be8e566b096e64a5df8ff290ec24fa58fbc/scripts/download-actionlint.bash)
+./actionlint "$@"