Don't use AArch64 runners for forks

Author: diegorusso

.github/workflows/jit.yml

@@ -62,6 +62,13 @@ jobs:
           - false
         llvm:
           - 19
+        is-fork:  # only used for the exclusion trick
+        - ${{ github.repository_owner != 'python' }}
+        exclude:
+        - target: aarch64-unknown-linux-gnu/gcc
+          is-fork: true
+        - target: aarch64-unknown-linux-gnu/clang
+          is-fork: true
         include:
           - target: i686-pc-windows-msvc/msvc
             architecture: Win32
@@ -95,12 +102,10 @@ jobs:
             architecture: aarch64
             runner: ubuntu-24.04-aarch64
             compiler: gcc
-            if: ${{ github.repository_owner == 'python' }}
           - target: aarch64-unknown-linux-gnu/clang
             architecture: aarch64
             runner: ubuntu-24.04-aarch64
             compiler: clang
-            if: ${{ github.repository_owner == 'python' }}
     env:
       CC: ${{ matrix.compiler }}
     steps: