Use variables from .env.sample instead of rewriting them

This will also make it easier to make changes in the future, since only
one place has to be updated with the new default variables.

Author: jyn514

.github/workflows/ci.yml

@@ -49,23 +49,16 @@ jobs:
           restore-key: |
             ${{ runner.os }}-cargo-build-target-${{ env.CURRENT_RUSTC_VERSION }}-
 
-      - name: Prepare the test environment
-        run: |
-          prefix=$(pwd)/ignored/prefix
-          mkdir -p ${prefix}/public-html
-          echo "::set-env name=CRATESFYI_PREFIX::${prefix}"
-
       - name: Launch the postgres image
         run: |
-          touch .env
+          cp .env.sample .env
+          . .env
+          mkdir -p ${CRATESFYI_PREFIX}/public-html
           docker-compose up -d db
-          # TODO: try to avoid hard-coding this username/password
-          export CRATESFYI_DATABASE_URL="postgresql://cratesfyi:password@localhost:5432/"
-          # Make sure the database is actually working
           # Give the database enough time to start up
           sleep 5
-          psql "$CRATESFYI_DATABASE_URL"
-          echo "::set-env name=CRATESFYI_DATABASE_URL::${CRATESFYI_DATABASE_URL}"
+          # Make sure the database is actually working
+          psql "${CRATESFYI_DATABASE_URL}"
 
       - name: Run rustfmt
         run: cargo fmt -- --check