Fix ubuntu 20 in CI

> This is a scheduled Ubuntu 20.04 brownout. Ubuntu 20.04 LTS runner will be removed on 2025-04-15. For more details, see actions/runner-images#11101

Issue: CLDSRV-668

Author: francoisferrand

.github/workflows/release.yaml

@@ -14,7 +14,7 @@ env:
 
 jobs:
   build-federation-image:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout
         uses: actions/checkout@v4

.github/workflows/tests.yaml

@@ -149,7 +149,7 @@ jobs:
       if: always()
 
   build:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     permissions:
       contents: read
       packages: write
@@ -189,7 +189,21 @@ jobs:
             git.commit-sha=${{ github.sha }}
           cache-from: type=gha,scope=pykmip
           cache-to: type=gha,mode=max,scope=pykmip
-      - name: Build and push MongoDB
+
+  build-federation-image:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Login to GitHub Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ github.token }}
+      - name: Build and push image for federation
         uses: docker/build-push-action@v5
         with:
           push: true