Chore(#39): Optimize github action workflow for tests

Seperate jobs based on DB type.
This avoid initializing all the services in every job.

This also makes it more stable, because sometimes mysql does not start.
Earlier, mysql not starting in other-DB tests cause the test to fail.
Now, Only the mysql test will be affected if mysql service doesnt start

.github/workflows/main.yml

@@ -14,19 +14,31 @@ on:
 
 
 jobs:
-  test:
-    name: test-python${{ matrix.python-version }}-${{ matrix.db-engine }}
+  test-sqlite:
+    name: test-python${{ matrix.python-version }}-sqlite
     strategy:
       matrix:
         python-version:
          - "3.6"
-         - "3.8"
          - "3.10"
-        db-engine:
-          - sqlite
-          - postgres
-          - mysql
     runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - uses: psf/black@stable
+      - name: Build
+        run: pip3 install -e . -r requirements/test.txt
+      - name: Run tests
+        run: pytest
+        env:
+          DB: sqlite
+
+  test-mysql:
+    name: test-python${{ matrix.python-version }}-mysql
+    strategy:
+      matrix:
+        python-version:
+         - "3.6"
+         - "3.10"
     services:
       mysql:
         image: mysql
@@ -40,6 +52,25 @@ jobs:
           --health-interval 5s
           --health-timeout 2s
           --health-retries 3
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - uses: psf/black@stable
+      - name: Build
+        run: pip3 install -e . -r requirements/test.txt
+      - name: Run tests
+        run: pytest
+        env:
+          DB: mysql
+
+  test-postgres:
+    name: test-python${{ matrix.python-version }}-postgres
+    strategy:
+      matrix:
+        python-version:
+         - "3.6"
+         - "3.10"
+    services:
       postgres:
         image: postgres
         ports:
@@ -52,6 +83,7 @@ jobs:
           --health-interval 5s
           --health-timeout 2s
           --health-retries 3
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v1
       - uses: psf/black@stable
@@ -60,5 +92,4 @@ jobs:
       - name: Run tests
         run: pytest
         env:
-          DB: ${{ matrix.db-engine }}
-
+          DB: postgres