feat: add teleportr unit tests to GH Actions with Postgres service

.github/workflows/teleportr.yml

+name: teleportr unit tests
+
+on:
+  push:
+    paths:
+      - 'go/teleportr/**'
+    branches:
+      - 'master'
+      - 'develop'
+      - '*rc'
+      - 'regenesis/*'
+  pull_request:
+    paths:
+      - 'go/teleportr/**'
+  workflow_dispatch:
+
+defaults:
+  run:
+    working-directory: './go/teleportr'
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    services:
+      postgres:
+        image: postgres
+        env:
+          POSTGRES_USER=postgres
+          POSTGRES_PASSWORD=password
+        ports:
+          - 5432:5432
+    steps:
+      - name: Install Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.16.x
+
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Test
+        run: go test -v ./...