feat(autoupdate): add build-tags input to renovate-autoupdate (#9)

The default Go build and test step has no way to pass build tags.
A repository that needs tags, such as fts5, fails its scheduled run.

The new build-tags input defaults to an empty string.
With tags set, the step must run go build and go test with -tags.
It also sets CGO_ENABLED=1, as go-pr.yaml does.
Without tags, the commands stay unchanged.
The go-test-command input still replaces the default commands.

.github/workflows/renovate-autoupdate.yaml

@@ -43,6 +43,11 @@ on:
         required: false
         type: string
         default: ""
+      build-tags:
+        description: "Build tags to pass to go build and go test (e.g., 'fts5'). The default commands then run with CGO_ENABLED=1. Ignored when go-test-command is set."
+        required: false
+        type: string
+        default: ""
       node:
         description: "Update and test the Node project. Turn off for a repo with no frontend to test."
         required: false
@@ -461,6 +466,7 @@ jobs:
         working-directory: ${{ inputs.go-working-directory }}
         env:
           GO_TEST_COMMAND: ${{ inputs.go-test-command }}
+          TAGS: ${{ inputs.build-tags }}
           GOTOOLCHAIN: auto
         run: |
           set -o pipefail
@@ -468,6 +474,10 @@ jobs:
             go mod verify
             if [ -n "$GO_TEST_COMMAND" ]; then
               bash -c "$GO_TEST_COMMAND"
+            elif [ -n "$TAGS" ]; then
+              export CGO_ENABLED=1
+              go build -tags "$TAGS" ./...
+              go test -tags "$TAGS" -race -cover ./...
             else
               go build ./...
               go test -race -cover ./...

README.md

@@ -188,6 +188,7 @@ The workflow finds `go.mod` and `package.json` itself and tests what exists. A r
 | `go-mod-tidy` | `true` | Run `go mod tidy` after a Go update. Turn it off for an Encore app, where tidy prunes `go.sum` entries the build needs. |
 | `go-prepare-command` | | Shell commands to run before the Go tests, for example installing a CLI. Append a tool directory to `$GITHUB_PATH` to put it on `PATH`. |
 | `go-test-command` | | Replaces the default `go build` and `go test`, for example `encore test ./...` for an Encore app. |
+| `build-tags` | | Build tags for the default `go build` and `go test`, for example `fts5`. Also sets `CGO_ENABLED=1`. Ignored when `go-test-command` is set. |
 | `node-version` | `22` | Node.js version |
 | `node` | `true` | Update and test the Node project. Turn off for a repo with no frontend to test. |
 | `node-working-directory` | `.` | Directory that holds `package.json`. Only this project is updated and tested. With `node-workspace`, the directory that holds the workspace files. |