Add Docker Buildx setup to CI workflows

- Introduced Docker Buildx setup in cd-auditservice.yml
- Introduced Docker Buildx setup in cd-shiftservice.yml
- Introduced Docker Buildx setup in cd-trustservice.yml

Author: PatrickZdarsky

.github/workflows/cd-auditservice.yml

@@ -25,6 +25,9 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
 
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v4
+
       - name: Login to GitHub Container Registry
         uses: docker/login-action@v3
         with:

.github/workflows/cd-shiftservice.yml

@@ -26,6 +26,9 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
 
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v4
+
       - name: Login to GitHub Container Registry
         uses: docker/login-action@v3
         with:

.github/workflows/cd-trustservice.yml

@@ -25,6 +25,9 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
 
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v4
+
       - name: Login to GitHub Container Registry
         uses: docker/login-action@v3
         with: