Update push.yml for versions 16, 18 & 19

I still expect them to be red, but enable them anyway.

Exclude a couple of configurations which error with a glibc error
("version `GLIBC_2.28` not found (required by node)").

.github/workflows/push.yml

@@ -19,18 +19,25 @@ jobs:
           - version: 10.x
           - version: 12.x
           - version: 14.x
-          # - version: 16.x
-          # - version: 18.x
-          # - version: 19.x
-          #   mirror: https://nodejs.org/download/nightly
-          # - version: 19.x
-          #   mirror: https://nodejs.org/download/v8-canary
+          - version: 16.x
+          - version: 18.x
+          - version: 19.x
+            mirror: https://nodejs.org/download/nightly
+          - version: 19.x
+            mirror: https://nodejs.org/download/v8-canary
         # os: [ubuntu-latest, macos-latest]
         # Temporarily disable MacOS until
         # https://github.com/nodejs/node/issues/32981 is fixed
         # TODO(mmarchini): test on 20.04 (need different lldb version)
         os: [ubuntu-18.04, ubuntu-20.04]
         llvm: [8, 9, 10, 11, 12, 13, 14]
+        exclude:
+          - os: ubuntu-18.04
+            node:
+              - version: 18.x
+          - os: ubuntu-18.04
+            node:
+              - version: 19.x
     steps:
       - uses: actions/checkout@v1
       - name: Use Node.js ${{ matrix.node.version }} ${{ matrix.node.mirror }}