Try to fix some required env vars

.github/workflows/main.yml

@@ -5,12 +5,16 @@ on: push
 jobs:
   tests:
     runs-on: ubuntu-latest
-    services:
-      docker-in-docker:
-        image: docker:dind
     steps:
       - uses: actions/checkout@v2
+      - name: Pull Postgres
+        run: docker pull postgres:14.0
+      - name: Pull MySQL
+        run: docker pull mysql:8.0.27
+      - name: Pull SQLServer
+        run: docker pull mcr.microsoft.com/mssql/server:2017-latest
       - name: Run linters
         run: go vet ./...
-      - name: Run tests
+      - name: Run Tests
         run: go test ./...
+