Use buf ls-modules for parsing config (#40)

Update the module name parsing to use `buf ls-modules` now we have `buf`
at v1.34.0 as a requirement. This also fixes an issue for root named
modules, which missed a call to `parseModules` causing the module to
fail. Added a test to cover the root name case.

See bufbuild/buf#3081

.github/workflows/ci.yaml

@@ -334,6 +334,34 @@ jobs:
           # On push github.ref_name, on delete github.event.ref_name.
           archive_labels: ${{ github.ref_name }}
           comment: false
+  test-archive-name:
+    # Check the archive command parses non-module names.
+    runs-on: ubuntu-latest
+    needs:
+      - test-push
+      - test-push-token-only
+      - test-push-unnamed
+    steps:
+      - uses: actions/checkout@v4
+      - env:
+          BUF_USERNAME: ${{ secrets.BUF_USERNAME }}
+        run: |
+          mkdir -p foo/v1
+          printf "version: v2\nname: ${BUF_MODULE}\n" > buf.yaml
+          printf "syntax = \"proto3\";\npackage foo.v1;\nmessage Bar {}\n" > foo/v1/bar.proto
+      - uses: ./
+        with:
+          username: ${{ secrets.BUF_USERNAME }}
+          token: ${{ secrets.BUF_TOKEN }}
+          lint: false
+          format: false
+          breaking: false
+          push: true # Push to re-create.
+          push_git_metadata: false
+          push_labels: ${{ github.event.ref }}-root-name
+          archive: true # Archive the pushed module.
+          archive_labels: ${{ github.event.ref }}-root-name
+          comment: false
   test-archive-not-exists:
     if: github.event_name == 'push'
     runs-on: ubuntu-latest