Add QEMU and xbuild to build (scratch)images in pr_build workflow

Signed-off-by: Marco Franssen <[email protected]>

Author: marcofranssen

.github/workflows/pr_build.yaml

@@ -152,6 +152,10 @@ jobs:
           key: ${{ runner.os }}-tools-${{ github.sha }}
           restore-keys: |
             ${{ runner.os }}-tools-
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
       - name: Build images
         run: make images
       - name: Export images
@@ -208,6 +212,10 @@ jobs:
           key: ${{ runner.os }}-tools-${{ github.sha }}
           restore-keys: |
             ${{ runner.os }}-tools-
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
       - name: Build scratch images
         run: make scratch-images
       - name: Export scratch images