Support Postgres 17

- Update Rust toolchain to 1.82.0
- Upgrade pgrx to 0.12.7
- Upgrade lettre to 0.11.10
- Add CI testing for multiple Postgres versions

.github/workflows/ci.yml

@@ -18,13 +18,37 @@ on:
 jobs:
   test:
     name: Test
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        PG_VERSION: [pg14, pg15, pg16, pg17]
+    env:
+      PG_VERSION: ${{ matrix.PG_VERSION }}
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions-rust-lang/setup-rust-toolchain@v1
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Rust Toolchain
+        uses: actions-rust-lang/setup-rust-toolchain@v1
         with:
-          toolchain: 1.77.2
+          toolchain: 1.82.0
           components: clippy, rustfmt
-      - run: make init
-      - run: make lint
-      - run: make test
+
+      - name: Cache Rust
+        uses: Swatinem/rust-cache@v2
+
+      - name: Cache pgrx
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.pgrx/
+          key: ${{ runner.os }}-pgrx
+
+      - name: Init
+        run: make init
+
+      - name: Lint
+        run: make lint
+
+      - name: Test
+        run: make test

CONTRIBUTING.md

@@ -1,5 +1,10 @@
 # pg_smtp_client
 
+## Install dependencies (needed for testing postgres 17)
+```shell
+sudo apt-get install bison flex
+```
+
 ## Setup
 
 ```shell