Use mirror.gcr.io as pull-through cache

Signed-off-by: Brad Davidson <[email protected]>

.github/workflows/build.yml

@@ -22,6 +22,12 @@ jobs:
   build-amd64:
     runs-on: runs-on,runner=8cpu-linux-x64,run-id=${{ github.run_id }},image=ubuntu22-full-x64,hdd=64
     steps:
+    - name: Set up buildx
+      uses: docker/setup-buildx-action@v3
+      with:
+        config-inline: |
+          [registry."docker.io"]
+            mirrors = ["mirror.gcr.io"]
     - name: Checkout code
       uses: actions/checkout@v4
     - name: Install Dapper
@@ -37,6 +43,12 @@ jobs:
   build-arm64:
     runs-on: runs-on,runner=8cpu-linux-arm64,run-id=${{ github.run_id }},image=ubuntu22-full-arm64,hdd=64
     steps:
+    - name: Set up buildx
+      uses: docker/setup-buildx-action@v3
+      with:
+        config-inline: |
+          [registry."docker.io"]
+            mirrors = ["mirror.gcr.io"]
     - name: Checkout code
       uses: actions/checkout@v4
     - name: Install Dapper
@@ -46,4 +58,4 @@ jobs:
     - name: Build
       run: |
         dapper -f Dockerfile --target dapper make dapper-ci
-        
+