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/frontend.yaml

@@ -0,0 +1,44 @@
+name: Frontend
+
+on:
+  workflow_call:
+  workflow_dispatch:
+
+env:
+  NODEJS_VERSION: '16'
+
+jobs:
+  frontend:
+    name: Build frontend
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+      with:
+        submodules: recursive
+
+    - uses: actions/setup-node@v3
+      with:
+        node-version: ${{ env.NODEJS_VERSION }}
+    
+    - name: Get npm cache directory
+      id: npm-cache-dir
+      run: |
+        echo "::set-output name=dir::$(npm config get cache)"
+    - uses: actions/cache@v3
+      id: npm-cache
+      with:
+        path: ${{ steps.npm-cache-dir.outputs.dir }}
+        key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
+        restore-keys: |
+          ${{ runner.os }}-node-
+
+    - name: Build frontends
+      run: make frontends
+
+    - name: 'Tar files to preserve file permissions'
+      run: tar -cvf frontend.tar ENVIRONMENT.txt GIT_HASH.txt frontend/dist frontend/config.json
+
+    - uses: actions/upload-artifact@v3
+      with:
+        name: frontend
+        path: frontend.tar