ci: update ci for testcontainers setup

Author: suchapalaver

.github/workflows/tests.yml

@@ -98,25 +98,15 @@ jobs:
       contents: write
       pull-requests: write
       actions: read
-    services:
-      postgres:
-        image: postgres:15
-        env:
-          POSTGRES_HOST_AUTH_METHOD: trust
-        options: >-
-          --health-cmd pg_isready
-          --health-interval 10s
-          --health-timeout 5s
-          --health-retries 5
-        ports:
-          - 5432:5432
-    container:
-      image: rust:1.86-bookworm
     env:
-      DATABASE_URL: postgres://postgres@postgres:5432
       CI: true
+      SQLX_OFFLINE: true
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          toolchain: 1.86
       - name: Install libsasl2-dev
         run: apt-get update && apt-get install -y libsasl2-dev
       - name: Cache dependencies
@@ -134,10 +124,6 @@ jobs:
         if: ${{ !startsWith(github.head_ref, 'renovate/') }}
       - name: Install cargo-llvm-cov
         uses: taiki-e/install-action@cargo-llvm-cov
-      - name: Install sqlx
-        run: cargo install sqlx-cli --no-default-features --features postgres
-      - name: Run the test sqlx migrations
-        run: cargo sqlx migrate run
       - name: Run tests and generate coverage report
         run: cargo llvm-cov test --all-features --workspace --lcov --output-path lcov.info
       - name: Upload coverage to Coveralls
@@ -153,24 +139,14 @@ jobs:
       contents: write
       pull-requests: write
       actions: read
-    services:
-      postgres:
-        image: postgres:15
-        env:
-          POSTGRES_HOST_AUTH_METHOD: trust
-        options: >-
-          --health-cmd pg_isready
-          --health-interval 10s
-          --health-timeout 5s
-          --health-retries 5
-        ports:
-          - 5432:5432
-    container:
-      image: rust:1.86-bookworm
     env:
-      DATABASE_URL: postgres://postgres@postgres:5432
+      SQLX_OFFLINE: true
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          toolchain: 1.86
       - name: Install libsasl2-dev
         run: apt-get update && apt-get install -y libsasl2-dev
       - name: Cache dependencies
@@ -186,9 +162,5 @@ jobs:
       - name: Run sccache-cache
         uses: mozilla-actions/sccache-action@7d986dd989559c6ecdb630a3fd2557667be217ad # v0.0.9
         if: ${{ !startsWith(github.head_ref, 'renovate/') }}
-      - name: Install sqlx
-        run: cargo install sqlx-cli --no-default-features --features postgres
-      - name: Run the test sqlx migrations
-        run: cargo sqlx migrate run
       - name: Test documentation code snippets
         run: cargo test --doc --all-features --workspace