Include maven dependencies in the CI cache key

Author: ibbem

.github/workflows/maven.yml

@@ -19,7 +19,7 @@ jobs:
     - name: Install Nix with cached packages
       uses: rikhuijzer/[email protected]
       with:
-        key: nix-${{ hashFiles('.github/workflows/maven.yml', 'default.nix', 'nix/**') }}
+        key: nix-${{ hashFiles('.github/workflows/maven.yml', 'default.nix', 'nix/**', 'pom.xml', 'local-maven-repo') }}
         nix_file: nix/github-workflow-dependencies.nix
     - name: Build
       run: nix-build