[workflows/release] have goreleaser open PRs to update tap

Currently `goreleaser` is attempting to push directly to trunk which is
blocked by our different rulesets. Instead, we can have `goreleaser`
open a PR and that can be merged manually so that we have no exceptions
for all changes being made through a PR.

#113

Author: ryan-ph

.github/workflows/release.yml

@@ -7,6 +7,8 @@ on:
 
 jobs:
   goreleaser:
+    permissions:
+      pull-requests: write
     runs-on: ubuntu-latest
     steps:
       - name: Checkout

.goreleaser.yml

@@ -35,7 +35,7 @@ changelog:
   filters:
     exclude:
       - '^docs:'
-      - '^test:'      
+      - '^test:'
       - Merge pull request
       - Merge branch
 brews:
@@ -45,3 +45,5 @@ brews:
     directory: Formula
     homepage: https://github.com/mercari/hcledit
     description: CLI to edit HCL configurations
+    pull_request:
+      enabled: true