Ignore ssh2 native extensions

We pull in ssh2 via dockerode:

dockerode
↳ docker-modem
  ↳ ssh2
    ↳ cpu-features

Both it and `cpu-features` compile _optional_ native extensions using
OpenSSH and cpu-features (https://github.com/google/cpu_features) which
result in node-gyp generating two `.node` executables for these bindings

We have found that these bindings are very sensitive to the build env
which means that developer laptops, Actions and Codespaces result in
a diff in the `.node` files, something we seek to prevent in PRs in
order to detect cases where code changes are committed without actually
being applied to the `dist/` folder.

Since we do not actually SSH into any containers in our implementation,
let's just ignore these files in our distributed code rather than
make our build more convoluted/less portable.

.gitignore

@@ -3,6 +3,10 @@ output/output.json
 repo
 tmp/
 
+# Ignore optional native extensions for SSH
+dist/*/build/Release/cpufeatures.node
+dist/*/lib/protocol/crypto/build/Release/sshcrypto.node
+
 # Dependency directory
 node_modules
 
@@ -98,7 +102,3 @@ typings/
 # OS metadata
 .DS_Store
 Thumbs.db
-
-# Ignore built ts files
-__tests__/runner/*
-lib/**/*