Prevent cancellation of in-progress workflows on main branch

Update `cancel-in-progress` concurrency settings in `ci-build.yaml` and `jax-array-api.yml` to avoid canceling runs triggered on the `main` branch.

PiperOrigin-RevId: 830665137

Author: nitins17

.github/workflows/ci-build.yaml

@@ -13,7 +13,8 @@ on:
 permissions: {}
 concurrency:
   group: ${{ github.workflow }}-${{ github.head_ref || github.ref }}
-  cancel-in-progress: true
+  # Don't cancel in-progress jobs for main branches.
+  cancel-in-progress: ${{ github.ref != 'main' }}
 
 env:
   UV_DEFAULT_INDEX: "https://us-python.pkg.dev/ml-oss-artifacts-published/pypi-mirror/simple"

.github/workflows/jax-array-api.yml

@@ -10,7 +10,8 @@ on:
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.head_ref || github.ref }}
-  cancel-in-progress: true
+  # Don't cancel in-progress jobs for main branches.
+  cancel-in-progress: ${{ github.ref != 'main' }}
 permissions: {}
 
 env: