Switching back on CI build matrix.

Author: jholloc

.github/workflows/cmake.yml

@@ -18,14 +18,11 @@ jobs:
   build:
     strategy:
       matrix:
-#        os: [ubuntu-latest, windows-latest, macos-latest]
-        os: [ubuntu-latest]
+        os: [ubuntu-latest, windows-latest, macos-latest]
         release: [Release]
-#        ssl: [ON, OFF]
-        ssl: [OFF]
+        ssl: [ON, OFF]
         client-only: [OFF]
-#        capnp: [ON, OFF]
-        capnp: [ON]
+        capnp: [ON, OFF]
 #        include:
 #          - client-only: ON
 #            ssl: OFF