dependabot: file changes and generate script

generate-dependabot.sh

@@ -0,0 +1,38 @@
+#!/bin/bash
+
+# Create .github directory if needed
+if [ ! -d .github ]; then
+    mkdir -p .github
+fi
+
+tmpfile=$(mktemp)
+
+# Make sure to cleanup our temp file on any kind of exit
+trap 'rm -f "$tmpfile"' EXIT
+
+# dependabot.yml header
+cat > "$tmpfile" <<'YAML'
+version: 2
+updates:
+  - package-ecosystem: "docker-compose"
+    schedule:
+      interval: weekly
+    directories:
+YAML
+
+# Find and sort all docker-compose.yml directories
+find docker -name 'docker-compose.yml' -print0 \
+  | xargs -0 -n1 dirname \
+  | sed 's|^\./||' \
+  | sort \
+  | while read -r dir; do
+      echo "      - \"/$dir\"" >> "$tmpfile"
+    done
+
+# Overwrite file on change
+if ! [ -f .github/dependabot.yml ] || ! cmp -s "$tmpfile" .github/dependabot.yml; then
+  mv "$tmpfile" .github/dependabot.yml
+  echo "Updated .github/dependabot.yml!"
+else
+  echo "No changes to .github/dependabot.yml."
+fi