feature: add /subscriptions endpoint and refactor code

.env

@@ -0,0 +1 @@
+DATABASE_URL="postgres://postgres:password@localhost:5432/newsletter"

.github/workflows/rust.yml

@@ -1,18 +1,56 @@
 name: Rust
 
-on: [push, pull_request]
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    types: [opened, synchronize, reopened]
+    branches:
+      - main
 
 env:
   CARGO_TERM_COLOR: always
+  SQLX_VERSION: 0.8.0
+  SQLX_FEATURES: "chrono,macros,migrate,postgres,runtime-tokio,tls-rustls,uuid"
 
 jobs:
   test:
     name: Test
     runs-on: ubuntu-latest
+    services:
+      # Label used to access the service container
+      postgres:
+        # Docker Hub image
+        image: postgres:14
+        # Environment variables scoped only for the `postgres` element
+        env:
+          POSTGRES_USER: postgres
+          POSTGRES_PASSWORD: password
+          POSTGRES_DB: postgres
+        # When you map ports using the ports keyword, GitHub uses the --publish command to publish the container’s ports to the Docker host
+        # Opens tcp port 5432 on the host and service container
+        ports:
+          - 5432:5432
     steps:
-      - uses: actions/checkout@v3
-      - uses: dtolnay/rust-toolchain@stable
-      - uses: Swatinem/rust-cache@v2
+      - name: Check out repository code
+        uses: actions/checkout@v3
+      - name: Install the Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+      - name: Rust cache cleanup
+        uses: Swatinem/rust-cache@v2
+        with:
+          key: sqlx-${{env.SQLX_VERSION}}
+      - name: Install slqx-client
+        run: cargo install sqlx-cli
+          --version={{env.SQLX_VERSION}}
+          --features ${{env.SQLX_FEATURES}}
+          --no-default-features
+          --locked
+      - name: Install postgresql-client
+        run: sudo apt-get update && sudo apt-get install postgresql-client -y
+      - name: Migrate database
+        run: SKIP_DOCKER=true ./scripts/init_db.sh
       - name: Run tests
         run: cargo test
 
@@ -30,24 +68,64 @@ jobs:
   clippy:
     name: Clippy
     runs-on: ubuntu-latest
+    services:
+      postgres:
+        image: postgres:14
+        env:
+          POSTGRES_USER: postgres
+          POSTGRES_PASSWORD: password
+          POSTGRES_DB: postgres
+        ports:
+          - 5432:5432
     steps:
       - uses: actions/checkout@v3
       - uses: dtolnay/rust-toolchain@stable
         with:
           components: clippy
       - uses: Swatinem/rust-cache@v2
+        with:
+          key: sqlx-${{env.SQLX_VERSION}}
+      - name: Install sqlx-client
+        run: cargo install sqlx-cli
+          --version={{env.SQLX_VERSION}}
+          --features ${{env.SQLX_FEATURES}}
+          --no-default-features
+          --locked
+      - name: Install postgresql-client
+        run: sudo apt-get update && sudo apt-get install postgresql-client -y
+      - name: Migrate database
+        run: SKIP_DOCKER=true ./scripts/init_db.sh
       - name: Linting
         run: cargo clippy -- -D warnings
 
   coverage:
     name: Code coverage
     runs-on: ubuntu-latest
-    container:
-      image: xd009642/tarpaulin
-      options: --security-opt seccomp=unconfined
+    services:
+      postgres:
+        image: postgres:14
+        env:
+          POSTGRES_USER: postgres
+          POSTGRES_PASSWORD: password
+          POSTGRES_DB: postgres
+        ports:
+          - 5432:5432
     steps:
       - name: Checkout repository
         uses: actions/checkout@v3
+      - uses: dtolnay/rust-toolchain@stable
+      - name: Install postgresql-client
+        run: sudo apt-get update && sudo apt-get install postgresql-client -y
+      - uses: Swatinem/rust-cache@v2
+        with:
+          key: sqlx-${{ env.SQLX_VERSION }}
+      - name: Install sqlx-cli
+        run: cargo install sqlx-cli
+          --version=${{ env.SQLX_VERSION }}
+          --features ${{ env.SQLX_FEATURES }}
+          --no-default-features
+          --locked
+      - name: Migrate database
+        run: SKIP_DOCKER=true ./scripts/init_db.sh
       - name: Generate code coverage
-        run: |
-          cargo tarpaulin --verbose --workspace
+        run: cargo install cargo-tarpaulin && cargo tarpaulin --verbose --workspace