outposts: include git commit hash in build from git branch

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

outpost/azure-pipelines.yml

@@ -117,6 +117,7 @@ stages:
               Dockerfile: 'outpost/proxy.Dockerfile'
               buildContext: 'outpost/'
               tags: "gh-$(branchName)"
+              arguments: '--build-arg GIT_BUILD_HASH=$(Build.SourceVersion)'
       - job: ldap_build_docker
         pool:
           vmImage: 'ubuntu-latest'
@@ -142,3 +143,4 @@ stages:
               Dockerfile: 'outpost/ldap.Dockerfile'
               buildContext: 'outpost/'
               tags: "gh-$(branchName)"
+              arguments: '--build-arg GIT_BUILD_HASH=$(Build.SourceVersion)'

outpost/ldap.Dockerfile

@@ -1,4 +1,6 @@
 FROM golang:1.16.4 AS builder
+ARG GIT_BUILD_HASH
+ENV GIT_BUILD_HASH=$GIT_BUILD_HASH
 
 WORKDIR /work
 

outpost/pkg/ak/global.go

@@ -33,7 +33,8 @@ func doGlobalSetup(config map[string]interface{}) {
 	default:
 		log.SetLevel(log.DebugLevel)
 	}
-	log.WithField("version", pkg.VERSION).Info("Starting authentik outpost")
+	buildHash := os.Getenv("GIT_BUILD_HASH")
+	log.WithField("buildHash", buildHash).WithField("version", pkg.VERSION).Info("Starting authentik outpost")
 
 	var dsn string
 	if config[ConfigErrorReportingEnabled].(bool) {

outpost/proxy.Dockerfile

@@ -1,4 +1,6 @@
 FROM golang:1.16.4 AS builder
+ARG GIT_BUILD_HASH
+ENV GIT_BUILD_HASH=$GIT_BUILD_HASH
 
 WORKDIR /work