CI: Lint the crate and examples

We are not currently running the linter in CI, do so.

Author: tcharding

.github/workflows/rust.yml

@@ -27,6 +27,10 @@ jobs:
         env:
           DO_FMT: true
         run: ./contrib/test.sh
+      - name: Running linter
+        env:
+          DO_LINT: true
+        run: ./contrib/test.sh
 
   Int-tests:
     name: Integration tests

contrib/test.sh

@@ -33,6 +33,21 @@ fi
 # Defaults / sanity checks
 cargo test
 
+if [ "$DO_LINT" = true ]; then
+    clippy="cargo +nightly clippy"
+
+    $clippy -- -D warnings
+
+    # Lint all the examples
+    $clippy --example htlc --features=compiler -- -D warnings
+    $clippy --example parse -- -D warnings
+    $clippy --example sign_multisig -- -D warnings
+    $clippy --example verify_tx -- -D warnings
+    $clippy --example xpub_descriptors -- -D warnings
+    $clippy --example taproot --features=compiler -- -D warnings
+    $clippy --example psbt_sign_finalize --features=base64 -- -D warnings
+fi
+
 if [ "$DO_FEATURE_MATRIX" = true ]
 then
     # All features