feat: setup CI to use .env_sample and postgres URI

.github/workflows/coverage.yml

@@ -51,6 +51,12 @@ jobs:
             target
           key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
 
+
+      - name: load env
+        run: |
+          source .env-sample \
+            && echo "POSTGRES_DATABASE_URL=$POSTGRES_DATABASE_URL" >> $GITHUB_ENV 
+
       - uses: actions/setup-node@v2
         with:
           node-version: "16.x"
@@ -74,7 +80,7 @@ jobs:
       - name: Run migrations
         run: make migrate
         env:
-          DATABASE_URL: postgres://postgres:password@localhost:5432/postgres
+          POSTGRES_DATABASE_URL: "${{ env.POSTGRES_DATABASE_URL }}"
 
       - name: build frontend
         run: make frontend
@@ -85,7 +91,7 @@ jobs:
         with:
           args: "-t 1200"
         env:
-          DATABASE_URL: postgres://postgres:password@localhost:5432/postgres
+          POSTGRES_DATABASE_URL: "${{ env.POSTGRES_DATABASE_URL }}"
           # GIT_HASH is dummy value. I guess build.rs is skipped in tarpaulin
           # execution so this value is required for preventing meta tests from
           # panicking