Unifies Docker build contexts, removes debug logs

Points build contexts to the project root for simpler Docker setup
Removes leftover debug statement to reduce console noise
Updates local build instructions

Author: mbertelsen

.dockerignore

@@ -7,4 +7,11 @@ README.md
 .nyc_output
 coverage
 .vscode
-dist
+dist
+
+# Ignore schema 'latest' which on Windows may be a symlink to a host path
+# that cannot be resolved inside the Linux build container. We create a real
+# schema/latest in the Dockerfile, so don't copy the host symlink into the
+# build context with COPY . .
+schema/latest
+src/schema/latest