fix: use gh CLI tool to upload homebrew formula

Per https://gist.github.com/swinton/03e84635b45c78353b1f71e41007fc7c,
it seems like this might avoid the commit signature requirement. The
goreleaser code seems to use the same API, but since it specifies an
author I wonder if that prevents GitHub from automatically signing the
commit as the GitHub Actions bot.

.github/workflows/release.yaml

@@ -29,3 +29,17 @@ jobs:
           args: release --rm-dist
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Commit homebrew forumulaa
+        env:
+          GITHUB_TOKEN:   ${{ secrets.GITHUB_TOKEN }}
+          FILE_TO_COMMIT: Formula/terraform-demux.rb
+        run: |
+          export MESSAGE="chore: regenerate $FILE_TO_COMMIT"
+          export SHA=$(git rev-parse --verify main:$FILE_TO_COMMIT)
+          export CONTENT=$(base64 -i $FILE_TO_COMMIT)
+          gh api --method PUT /repos/:owner/:repo/contents/$FILE_TO_COMMIT \
+            --field message="$MESSAGE" \
+            --field content="$CONTENT" \
+            --field encoding="base64" \
+            --field sha="$SHA"

.goreleaser.yaml

@@ -14,11 +14,8 @@ brews:
       owner: etsy
       name:  terraform-demux
 
-    folder: Formula
-
-    commit_author:
-      name:  github-actions[bot]
-      email: 41898282+github-actions[bot]@users.noreply.github.com
+    folder:      Formula
+    skip_upload: true
 
     homepage:    https://github.com/etsy/terraform-demux
     description: A user-friendly launcher (à la Bazelisk) for Terraform.