release: Change GitHub token for Tap modifications (#199)

Changes the GitHub Personal Access Token which is used to create a PR
against elastic/tap to update ecctl's homebrew formula.

Signed-off-by: Marc Lopez <marc5.12@outlook.com>

Author: marclop

.github/workflows/release.yml

@@ -55,9 +55,10 @@ jobs:
 
       - name: Run release post actions
         run: ./scripts/goreleaser-post-actions.sh $VERSION
-        env: 
-          GITHUB_TOKEN: ${{ secrets.GH_TOKEN_EXTRA }}
-          GITHUB_USER: marclop
+        env:
+          # elasticcloudmachine GitHub token.
+          GITHUB_TOKEN: ${{ secrets.HOMEBREW_TAP_GH_TOKEN }}
+          GITHUB_USER: elasticcloudmachine
           VERSION: ${{ steps.get_version.outputs.VERSION }}
           AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
           AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}