CI: correct YAML syntax / regression

Helps hexops/mach#248

Signed-off-by: Stephen Gutekanst <stephen@hexops.com>

.github/workflows/m1_ci.yml

@@ -9,7 +9,7 @@ on:
   - push
 jobs:
   aarch64-macos:
-    if: github.repository == 'hexops/mach'
+    if: ${{ github.repository == 'hexops/mach' }}
     runs-on: [self-hosted, macOS, ARM64]
     strategy:
       matrix:

glfw/.github/workflows/m1_ci.yml

@@ -9,7 +9,7 @@ on:
   - push
 jobs:
   aarch64-macos:
-    if: github.repository == 'hexops/mach-glfw'
+    if: ${{ github.repository == 'hexops/mach-glfw' }}
     runs-on: [self-hosted, macOS, ARM64]
     defaults:
       run:

gpu-dawn/.github/workflows/m1_ci.yml

@@ -6,8 +6,7 @@ on:
       - completed
 jobs:
   aarch64-macos:
-    if: ${{ github.event.workflow_run.conclusion == 'success' }}
+    if: ${{ github.repository == 'hexops/mach-gpu-dawn' && github.event.workflow_run.conclusion == 'success' }}
-    if: github.repository == 'hexops/mach-gpu-dawn'
     runs-on: [self-hosted, macOS, ARM64]
     defaults:
       run: