Document command to only build core Airbyte systems. (#2351)

.gitignore

@@ -2,6 +2,7 @@
 .idea
 *.iml
 build
+out
 .DS_Store
 data
 .dockerversions

build.gradle

@@ -53,7 +53,7 @@ def createSpotlessTarget = { pattern ->
         'tools'
     ]
 
-    if(System.getenv().containsKey("CORE_ONLY")) {
+    if (System.getenv().containsKey("CORE_ONLY")) {
         excludes.add("airbyte-integrations/connectors")
     }
 

docs/contributing-to-airbyte/developing-locally.md

@@ -36,7 +36,12 @@ To compile the code and run unit tests:
 
 This will build all the code and run all the unit tests.
 
-`./gradle build` creates all the necessary artifacts \(Webapp, Jars and Docker images\) so that you can run Airbyte locally.
+`./gradlew build` creates all the necessary artifacts \(Webapp, Jars and Docker images\) so that you can run Airbyte locally. Since this builds everything, it can take some time.
+
+To compile and build just the core systems:
+```bash
+CORE_ONLY=1 ./gradlew build
+```
 
 {% hint style="info" %}
 On Mac, if you run into an error while compiling openssl \(this happens when running pip install\), you may need to explicitly add these flags to your bash profile so that the C compiler can find the appropriate libraries.

settings.gradle

@@ -11,9 +11,6 @@ gradleEnterprise {
     }
 }
 
-import groovy.io.FileType
-import java.nio.file.Files
-
 rootProject.name = 'airbyte'
 
 include ':airbyte-analytics'
@@ -49,6 +46,7 @@ include ':airbyte-test-utils'
 include ':tools:code-generator'
 
 if(!System.getenv().containsKey("CORE_ONLY")) {
+    println "Building all of Airbyte."
     // include all connector projects
     def integrationsPath = rootDir.toPath().resolve('airbyte-integrations/connectors')
     println integrationsPath
@@ -59,4 +57,6 @@ if(!System.getenv().containsKey("CORE_ONLY")) {
             include ":airbyte-integrations:connectors:${dir.getFileName()}"
         }
     }
+} else {
+    println "Building Airbyte Core."
 }