chore: nix build checkout

Author: soedirgo

.github/workflows/nix-build.yml

@@ -27,7 +27,6 @@ jobs:
       - name: Check out code
         uses: actions/checkout@v4
         with:
-          ref: ${{ github.event.pull_request.head.ref || github.ref }}
           fetch-depth: 0
           fetch-tags: true
       - name: aws-creds
@@ -56,4 +55,3 @@ jobs:
                     -e AWS_SESSION_TOKEN=${{ env.AWS_SESSION_TOKEN }} \
                     base_nix bash -c "./workspace/docker/nix/build_nix.sh"
     name: build psql bundle on ${{ matrix.arch }}
-