Set unused github.token gitconfig to satisfy GH Pkgs plugin

See comment for details. Also changes the author info so that it looks like GHA did the work instead of meaningless info.

Author: colindean

.github/workflows/scala-steward.yaml

@@ -13,13 +13,20 @@ jobs:
     runs-on: ubuntu-latest
     name: Launch Scala Steward
     steps:
-      - uses: actions/setup-java@v3
+      - name: Configure unused GitHub Token via git
+        # This is required because SBT is configured to look at env:GITHUB_TOKEN or git:github.token or env:SHELL
+        # to get a token for publishing even when not executing the publish task. Most of the time, SHELL is set
+        # but apparently not inside GitHub Actions runners. Setting _something invalid_ satisfies the
+        # GitHub Packages plugin safely and allows the operation to proceed.
+        run: git config github.token unused
+      - name: Install JDK for Scala Steward use
+        uses: actions/setup-java@v3
         with:
           distribution: 'temurin'
           java-version: '8'
       - name: Launch Scala Steward
         uses: scala-steward-org/scala-steward-action@v2
         with:
           github-token: ${{ secrets.REPO_GITHUB_TOKEN }}
-          author-email: 12345+octocat@users.noreply.github.com
-          author-name: "Scala Steward on GitHub Actions"
+          author-email: "41898282+github-actions[bot]@users.noreply.github.com"
+          author-name: "github-actions[bot]"