add x86 build and run unittests to backend pipeline (#1682)

* add build backend for x86_64

* remove unnecessary build steps

* install backend dependency

* build and run backend unittest

* fix cache key

* buildx is required, qemu is not.

* Add missing steps from Makefile

* fix build_command var is unused

* select more common test env

* update pipeline names and docs

* use variable for node version

* use correct artifact name

* update pipeline references

* skip unittest that needs ca-cert installed

* correct pipeline name

* use nextest pre-built binary; add term color

* fix cache permissions warning

* update documentation

.github/workflows/product.yaml

@@ -19,10 +19,7 @@ jobs:
     - uses: actions/checkout@v3
       with:
         submodules: recursive
-        
-    - name: Set up QEMU
-      uses: docker/setup-qemu-action@v1
-      
+
     - name: Set up Docker Buildx        
       uses: docker/setup-buildx-action@v1
 
@@ -56,10 +53,7 @@ jobs:
     - uses: actions/checkout@v3
       with:
         submodules: recursive
-        
-    - name: Set up QEMU
-      uses: docker/setup-qemu-action@v1
-      
+
     - name: Set up Docker Buildx        
       uses: docker/setup-buildx-action@v1
 
@@ -72,10 +66,10 @@ jobs:
         path: system-images/utils/utils.tar
 
   backend:
-    uses: ./.github/workflows/backend-pr.yaml
+    uses: ./.github/workflows/backend.yaml
   
   frontend:
-    uses: ./.github/workflows/frontend-pr.yaml
+    uses: ./.github/workflows/frontend.yaml
     
   image:
     name: Build image
@@ -113,11 +107,11 @@ jobs:
     - name: Download backend artifact
       uses: actions/download-artifact@v3
       with:
-        name: backend
+        name: backend-aarch64
 
     - name: 'Extract backend'
       run: 
-        tar -mxvf backend.tar
+        tar -mxvf backend-aarch64.tar
 
     - name: Download frontend artifact
       uses: actions/download-artifact@v3