Allow releasing from a branch other than master

This is useful for cutting a patch release for the previous version
when master already contains work that shouldn't be released yet; for
example, v0.63.1 had to be tagged and released by hand from a v0.63.1
branch off the v0.63.0 tag because the workflow could only release
master.

Scheduled runs are unaffected: with no input provided, the ref is
empty and the checkout falls back to the default branch.

.github/workflows/release.yml

@@ -17,6 +17,11 @@ on:
         options:
           - minor
           - patch
+      branch:
+        description: 'Branch to release from'
+        type: string
+        required: true
+        default: 'master'
       ignore_blocks:
         description: 'Ignore blocking PRs/issues'
         type: boolean
@@ -49,6 +54,7 @@ jobs:
         uses: actions/checkout@v7
         with:
           repository: jesseduffield/lazygit
+          ref: ${{ inputs.branch }}
           token: ${{ secrets.LAZYGIT_RELEASE_PAT }}
           fetch-depth: 0