fix(workflows): Adjustments to buildenvs pipelines (#2188)

Reviewed-by: Cezar Craciunoiu <cezar.craciunoiu@unikraft.io>
Approved-by: Cezar Craciunoiu <cezar.craciunoiu@unikraft.io>

Author: craciunoiuc

.github/workflows/buildenvs.yaml

@@ -174,6 +174,7 @@ jobs:
 
   myself:
     runs-on: ubuntu-latest
+    needs: [xen, qemu]
     steps:
       - name: Get changed files
         if: ${{ github.event_name == 'pull_request' }}
@@ -228,6 +229,25 @@ jobs:
           username: ${{ secrets.REG_USERNAME }}
           password: ${{ secrets.REG_TOKEN }}
 
+      - name: Download 'kraftkit.sh/qemu' artifacts
+        if: ${{ steps.check-run.outputs.run == 'true' }}
+        uses: actions/download-artifact@v4
+        with:
+          name: qemu-oci-image
+          path: /tmp
+
+      - name: Download 'kraftkit.sh/xen' artifacts
+        if: ${{ steps.check-run.outputs.run == 'true' }}
+        uses: actions/download-artifact@v4
+        with:
+          name: xen-oci-image
+          path: /tmp
+
+      - name: Load Docker image
+        if: ${{ steps.check-run.outputs.run == 'true' }}
+        run: |
+          for I in /tmp/*.tar; do docker load --input "${I}"; done
+
       - name: Build OCI image
         if: ${{ steps.check-run.outputs.run == 'true' }}
         uses: docker/build-push-action@v6
@@ -313,20 +333,27 @@ jobs:
           username: ${{ secrets.REG_USERNAME }}
           password: ${{ secrets.REG_TOKEN }}
 
-      - name: Download artifacts
+      - name: Download 'kraftkit.sh/myself' artifacts
         if: ${{ steps.check-run.outputs.run == 'true' }}
         uses: actions/download-artifact@v4
         with:
           name: myself-oci-image
           path: /tmp
 
-      - name: Download artifacts
+      - name: Download 'kraftkit.sh/qemu' artifacts
         if: ${{ steps.check-run.outputs.run == 'true' }}
         uses: actions/download-artifact@v4
         with:
           name: qemu-oci-image
           path: /tmp
 
+      - name: Download 'kraftkit.sh/xen' artifacts
+        if: ${{ steps.check-run.outputs.run == 'true' }}
+        uses: actions/download-artifact@v4
+        with:
+          name: xen-oci-image
+          path: /tmp
+
       - name: Load Docker image
         if: ${{ steps.check-run.outputs.run == 'true' }}
         run: |
@@ -404,21 +431,21 @@ jobs:
           username: ${{ secrets.REG_USERNAME }}
           password: ${{ secrets.REG_TOKEN }}
 
-      - name: Download artifacts
+      - name: Download 'kraftkit.sh/myself' artifacts
         if: ${{ steps.check-run.outputs.run == 'true' }}
         uses: actions/download-artifact@v4
         with:
           name: myself-oci-image
           path: /tmp
 
-      - name: Download artifacts
+      - name: Download 'kraftkit.sh/qemu' artifacts
         if: ${{ steps.check-run.outputs.run == 'true' }}
         uses: actions/download-artifact@v4
         with:
           name: qemu-oci-image
           path: /tmp
 
-      - name: Download artifacts
+      - name: Download 'kraftkit.sh/xen' artifacts
         if: ${{ steps.check-run.outputs.run == 'true' }}
         uses: actions/download-artifact@v4
         with:
@@ -512,15 +539,14 @@ jobs:
         with:
           driver: docker
 
-
-      - name: Download artifacts
+      - name: Download 'kraftkit.sh/myself' artifacts
         if: ${{ steps.check-run.outputs.run == 'true' }}
         uses: actions/download-artifact@v4
         with:
           name: myself-oci-image
           path: /tmp
 
-      - name: Download artifacts
+      - name: Download 'kraftkit.sh/qemu' artifacts
         if: ${{ steps.check-run.outputs.run == 'true' }}
         uses: actions/download-artifact@v4
         with: