[MM-14400] Programmatically generate default.json (#10551)

* create/update config.json using go generate

* added default config generator
added config-reset to Jenkins and make package, updated defaults to consider 'isNew' flag

* corrections after code review

* fixed Config.isValid to handle empty encryption keys

* fixed Config.isValid to handle empty encryption keys

* fixed Config.isValid to handle empty encryption keys

* isUpdate now only checks for nil

* Addressed review comments, added unit testing for default config generator

* err shadowing

* license

* provide output file for config generator via ENV variable, since go generate doesn't support arguments and we need two output paths (config-reset and package)

* cleanup

* proper defaults for PushNotificationServer and SendPushNotifications

* corrected generating defaults for TrustedProxyIPHeader to be consistent with default.json in master

* Check for empty SiteURL as well as nil

* corrected SiteURL settings and checking

* crazy typos fixed

* corrected tests to newly expected values

* relaxed the checks

* fixed formatting

build/Jenkinsfile.k8s

@@ -136,7 +136,7 @@ podTemplate(label: 'jenkins-slave',
             sh 'apt-get update && apt-get install zip -y'
 
             // Modify config to run on jenkins
-            sh 'mv /go/src/github.com/mattermost/mattermost-server/config/default.json /go/src/github.com/mattermost/mattermost-server/config/config.json'
+            sh 'cd /go/src/github.com/mattermost/mattermost-server && make config-reset'
             sh 'cd /go/src/github.com/mattermost/mattermost-server && sed -i \'s/dockerhost/localhost/g\' config/config.json'
             sh 'cd /go/src/github.com/mattermost/mattermost-server && sed -i \'s/2500/10025/g\' config/config.json'
         }

build/Jenkinsfile.pr

@@ -100,7 +100,7 @@ pipeline {
                     ansiColor('xterm') {
                         sh """
                             cd /go/src/github.com/mattermost/mattermost-server
-                            mv config/default.json config/config.json || echo ""
+                            make config-reset
                             make check-style BUILD_NUMBER='${BRANCH_NAME}-${BUILD_NUMBER}'
                             make build BUILD_NUMBER='${BRANCH_NAME}-${BUILD_NUMBER}'
                             make package BUILD_NUMBER='${BRANCH_NAME}-${BUILD_NUMBER}'

build/release.mk

@@ -34,7 +34,7 @@ package:
 	@# Resource directories
 	mkdir -p $(DIST_PATH)/config
 	cp -L config/README.md $(DIST_PATH)/config
-	cp -L config/config.json $(DIST_PATH)/config
+	OUTPUT_CONFIG=$(PWD)/$(DIST_PATH)/config/config.json go generate ./config
 	cp -RL fonts $(DIST_PATH)
 	cp -RL templates $(DIST_PATH)
 	cp -RL i18n $(DIST_PATH)