Add test and lint actions

.github/workflows/lint.yml

@@ -0,0 +1,24 @@
+name: MLServer Lint
+
+on:
+  push:
+    branches: [ $default-branch ]
+  pull_request:
+    branches: [ $default-branch ]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+
+    steps:
+        - uses: actions/checkout@v2
+        - name: Set up Python 3.7
+          uses: actions/setup-python@v2
+          with:
+            python-version: 3.7.10
+        - name: Install dependencies
+          run: |
+            make install-dev
+        - name: Lint 
+          run: |
+            make lint

.github/workflows/tests.yml

@@ -0,0 +1,24 @@
+name: MLServer Tests
+
+on:
+  push:
+    branches: [ $default-branch ]
+  pull_request:
+    branches: [ $default-branch ]
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+
+    steps:
+        - uses: actions/checkout@v2
+        - name: Set up Python 3.7
+          uses: actions/setup-python@v2
+          with:
+            python-version: 3.7.10
+        - name: Install dependencies
+          run: |
+            make install-dev
+        - name: Test
+          run: |
+            make test