feat(autoupdate): update only the directories that are tested

Renovate updated every go.mod and package.json in a repo, while the tests
cover one module and one Node project. An update outside them would merge
untested. Restrict the managers to the configured directories, and add go
and node switches for a repo that has no Go code or no frontend to test.

.github/workflows/renovate-autoupdate.yaml

@@ -13,8 +13,13 @@ on:
         required: false
         type: string
         default: ">=1.24"
+      go:
+        description: "Update and test the Go module. Turn off for a repo with no Go code."
+        required: false
+        type: boolean
+        default: true
       go-working-directory:
-        description: "Directory that holds go.mod"
+        description: "Directory that holds go.mod. Only this module is updated and tested."
         required: false
         type: string
         default: "."
@@ -23,8 +28,13 @@ on:
         required: false
         type: string
         default: "22"
+      node:
+        description: "Update and test the Node project. Turn off for a repo with no frontend to test."
+        required: false
+        type: boolean
+        default: true
       node-working-directory:
-        description: "Directory that holds package.json"
+        description: "Directory that holds package.json. Only this project is updated and tested."
         required: false
         type: string
         default: "."
@@ -106,6 +116,10 @@ jobs:
         env:
           MIN_AGE: ${{ inputs.minimum-release-age }}
           MAJOR_UPDATES: ${{ inputs.major-updates }}
+          USE_GO: ${{ inputs.go }}
+          USE_NODE: ${{ inputs.node }}
+          GO_DIR: ${{ inputs.go-working-directory }}
+          NODE_DIR: ${{ inputs.node-working-directory }}
           CONFIG_FILE: ${{ runner.temp }}/renovate-autoupdate-config.json
         run: |
           jq -n \
@@ -113,14 +127,22 @@ jobs:
             --arg age "$MIN_AGE" \
             --arg branch_prefix "${BATCH_BRANCH%%/*}/" \
             --arg majors "$MAJOR_UPDATES" \
+            --argjson use_go "$USE_GO" \
+            --argjson use_node "$USE_NODE" \
+            --arg go_dir "$GO_DIR" \
+            --arg node_dir "$NODE_DIR" \
             '
+            # A regex for files directly inside a directory, so only what the tests cover is updated.
+            def prefix($d): (if $d == "." or $d == "" then "" else ($d | ltrimstr("./") | rtrimstr("/")) + "/" end) | gsub("\\."; "\\.");
             {
               platform: "github",
               repositories: [$repo],
               onboarding: false,
               requireConfig: "optional",
               branchPrefix: $branch_prefix,
-              enabledManagers: ["gomod", "npm"],
+              enabledManagers: ((if $use_go then ["gomod"] else [] end) + (if $use_node then ["npm"] else [] end)),
+              gomod: {managerFilePatterns: ["/^" + prefix($go_dir) + "go\\.mod$/"]},
+              npm: {managerFilePatterns: ["/^" + prefix($node_dir) + "package\\.json$/", "/^" + prefix($node_dir) + "pnpm-workspace\\.yaml$/"]},
               dependencyDashboard: false,
               # Branches only: with no dashboard, no PR is ever opened. The workflow opens it after the tests.
               prCreation: "approval",
@@ -248,12 +270,14 @@ jobs:
         env:
           GO_DIR: ${{ inputs.go-working-directory }}
           NODE_DIR: ${{ inputs.node-working-directory }}
+          USE_GO: ${{ inputs.go }}
+          USE_NODE: ${{ inputs.node }}
         run: |
           go=false
           node=false
           pm=npm
-          if [ -f "$GO_DIR/go.mod" ]; then go=true; fi
-          if [ -f "$NODE_DIR/package.json" ]; then
+          if [ "$USE_GO" = true ] && [ -f "$GO_DIR/go.mod" ]; then go=true; fi
+          if [ "$USE_NODE" = true ] && [ -f "$NODE_DIR/package.json" ]; then
             node=true
             if [ -f "$NODE_DIR/pnpm-lock.yaml" ]; then pm=pnpm
             elif [ -f "$NODE_DIR/yarn.lock" ]; then pm=yarn