Install git before actions/checkout

This fixes the workflow failing at "Build and install JAX" step as it wasn't able to run git command to fetch the `jaxlib` git hash

Without git present on the PATH, it seems that `actions/checkout` (from its logs) will download the code with the GitHub REST API. This results in the code not being a git repository and therefore any subsequent git commands fail.

PiperOrigin-RevId: 700518101

Author: nitins17

.github/workflows/asan.yaml

@@ -25,14 +25,8 @@ jobs:
       run:
         shell: bash -l {0}
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-        with:
-          path: jax
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-        with:
-          repository: python/cpython
-          path: cpython
-          ref: v3.13.0
+      # Install git before actions/checkout as otherwise it will download the code with the GitHub
+      # REST API and therefore any subsequent git commands will fail.
       - name: Install clang 18
         env:
           DEBIAN_FRONTEND: noninteractive
@@ -42,6 +36,14 @@ jobs:
             zlib1g-dev libbz2-dev libreadline-dev libsqlite3-dev curl git \
             libncursesw5-dev xz-utils tk-dev libxml2-dev libxmlsec1-dev \
             libffi-dev liblzma-dev
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        with:
+          path: jax
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        with:
+          repository: python/cpython
+          path: cpython
+          ref: v3.13.0
       - name: Build CPython with ASAN enabled
         env:
           ASAN_OPTIONS: detect_leaks=0