Add HOMEBREW_NO_INSTALL_FROM_API for tests

Author: rfay

.github/workflows/tests.yml

@@ -22,6 +22,8 @@ env:
   NIGHTLY_DDEV_PR_URL: "https://nightly.link/ddev/ddev/actions/runs/1720215802/ddev-linux-amd64.zip"
   # Allow ddev get to use a github token to prevent rate limiting by tests
   DDEV_GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+  # Allow `--HEAD` flag when running tests against HEAD
+  HOMEBREW_NO_INSTALL_FROM_API: 1
 
 jobs:
   tests: