Merge #747: Run code coverage on every PR

aa0ea6a codecov: warn about missing features (Daniela Brozzoni)
c3a7bbb codecov: slightly change the test features (Daniela Brozzoni)
1c4d478 Run code coverage on every PR (Daniela Brozzoni)

Pull request description:

  ### Checklists

  #### All Submissions:

  * [x] I've signed all my commits
  * [x] I followed the [contribution guidelines](https://github.com/bitcoindevkit/bdk/blob/master/CONTRIBUTING.md)
  * [x] I ran `cargo fmt` and `cargo clippy` before committing

ACKs for top commit:
  notmandatory:
    ACK aa0ea6a
  afilini:
    ACK aa0ea6a

Tree-SHA512: c2d0d9ad1e956f1c1808b46394f810939154442534241f9a023f18173910339ac236a5b6c66f78207dd2cb90a8f18000fc057b960e3354e2882c627fe1ef2c9f

.github/workflows/code_coverage.yml

@@ -1,4 +1,4 @@
-on: [push]
+on: [push, pull_request]
 
 name: Code Coverage
 
@@ -38,7 +38,13 @@ jobs:
       - name: Install grcov
         run: if [[ ! -e ~/.cargo/bin/grcov ]]; then cargo install grcov; fi
       - name: Test
-        run: cargo test --features default,minimal,all-keys,compact_filters,key-value-db,compiler,sqlite,sqlite-bundled,test-electrum,verify,test-rpc
+        # WARNING: this is not testing the following features: test-esplora, test-hardware-signer, async-interface
+        # This is because some of our features are mutually exclusive, and generating various reports and
+        # merging them doesn't seem to be working very well.
+        # For more info, see:
+        # - https://github.com/bitcoindevkit/bdk/issues/696
+        # - https://github.com/bitcoindevkit/bdk/pull/748#issuecomment-1242721040
+        run: cargo test --features all-keys,compact_filters,compiler,key-value-db,sqlite,sqlite-bundled,test-electrum,test-rpc,verify
       - name: Run grcov
         run: mkdir coverage; grcov . --binary-path ./target/debug/ -s . -t lcov --branch --ignore-not-existing --ignore '/*' -o ./coverage/lcov.info
       - name: Generate HTML coverage report