feat: add GitHub Actions workflows for code quality and automation (#2)

run.sh

@@ -0,0 +1,64 @@
+#!/usr/bin/env bash
+
+# Check if the OS is macOS or Linux
+if [[ $OSTYPE == "darwin"* ]]; then
+  # macOS needs -i .bak because it doesn't support -i without arguments
+  SED_CMD="sed -i .bak"
+else
+  # Linux supports -i without arguments
+  SED_CMD="sed -i"
+fi
+
+find . -mindepth 1 -maxdepth 1 -type d | while read -r dir; do
+  dir=${dir#./}
+  action="./$dir/action.yml"
+
+  # if action doesn't exist, skip
+  if [ ! -f "$action" ]; then
+    continue
+  fi
+
+  repo="ivuorinen/actions/$dir"
+  readme="./$dir/README.md"
+  version=$(grep -E '^# version:' "$action" | cut -d ' ' -f 2)
+
+  # if version doesn't exist, use 'main'
+  if [ -z "$version" ]; then
+    version="main"
+  fi
+
+  echo "Updating $readme..."
+
+  printf "# %s\n\n" "$repo" >"$readme"
+
+  echo "- Generating action documentation..."
+  npx --yes action-docs@latest \
+    --source="$action" \
+    --no-banner \
+    --include-name-header >>"$readme"
+
+  echo "- Replacing placeholders in $readme..."
+  $SED_CMD "s|PROJECT|$repo|g; s|VERSION|$version|g; s|\*\*\*||g" "$readme"
+
+  if [ -f "$readme.bak" ]; then
+    rm "$readme.bak"
+    echo "- Removed $readme.bak"
+  fi
+done
+echo ""
+
+echo "Running markdownlint..."
+npx --yes markdownlint-cli --fix \
+  --ignore "**/node_modules/**" "**/README.md"
+echo ""
+
+echo "Running prettier..."
+npx --yes prettier --write \
+  "run.sh", "**/README.md" "**/action.yml" ".github/workflows/*.yml"
+echo ""
+
+echo "Running MegaLinter..."
+npx --yes mega-linter-runner
+echo ""
+
+echo "Done!"