Go builds: Use local toolchain

Use the local Go toolchain (the Go version included in the Omnibus
builder images) for all Go builds. This prevents us from
accidentally building Go binaries with another Go version.

Go toolchain documentation: https://go.dev/doc/toolchain

Author: Clemens Beck

config/software/alertmanager.rb

@@ -38,6 +38,7 @@
   env = {
     'GOPATH' => "#{Omnibus::Config.source_dir}/alertmanager",
     'GO111MODULE' => 'on',
+    'GOTOOLCHAIN' => 'local',
   }
   exporter_source_dir = "#{Omnibus::Config.source_dir}/alertmanager"
   cwd = "#{exporter_source_dir}/src/#{go_source}"

config/software/consul.rb

@@ -33,7 +33,9 @@
 build do
   env = {}
   env['GOPATH'] = "#{Omnibus::Config.source_dir}/consul"
+  env['GOTOOLCHAIN'] = 'local'
   env['PATH'] = "#{Gitlab::Util.get_env('PATH')}:#{env['GOPATH']}/bin"
+
   command 'make dev', env: env
   mkdir "#{install_dir}/embedded/bin"
   copy 'bin/consul', "#{install_dir}/embedded/bin/"

config/software/docker-distribution-pruner.rb

@@ -29,7 +29,10 @@
 relative_path 'src/gitlab.com/gitlab-org/docker-distribution-pruner'
 
 build do
-  env = { 'GOPATH' => "#{Omnibus::Config.source_dir}/docker-distribution-pruner" }
+  env = {
+    'GOPATH' => "#{Omnibus::Config.source_dir}/docker-distribution-pruner",
+    'GOTOOLCHAIN' => 'local',
+  }
 
   command "go build -ldflags '-s -w' ./cmds/docker-distribution-pruner", env: env
 

config/software/gitlab-pages.rb

@@ -29,9 +29,12 @@
 relative_path 'src/gitlab.com/gitlab-org/gitlab-pages'
 
 build do
-  # This is required for GO15VENDOREXPERIMENT=1 to work properly,
-  # since it requires the package to be in $GOPATH/src/package
-  env = { 'GOPATH' => "#{Omnibus::Config.source_dir}/gitlab-pages" }
+  env = {
+    # This is required for GO15VENDOREXPERIMENT=1 to work properly,
+    # since it requires the package to be in $GOPATH/src/package
+    'GOPATH' => "#{Omnibus::Config.source_dir}/gitlab-pages",
+    'GOTOOLCHAIN' => 'local',
+  }
 
   # Pages compiles with CGO_ENABLED=0 by default, so we need to activate
   # FIPS mode explicitly.

config/software/go-crond.rb

@@ -28,6 +28,7 @@
 build do
   env = {
     'GOPATH' => "#{Omnibus::Config.source_dir}/go-crond",
+    'GOTOOLCHAIN' => 'local',
   }
 
   make 'build', env: env

config/software/node-exporter.rb

@@ -37,6 +37,7 @@
     'GOPATH' => "#{Omnibus::Config.source_dir}/node-exporter",
     'CGO_ENABLED' => '0', # Details: https://github.com/prometheus/node_exporter/issues/870
     'GO111MODULE' => 'on',
+    'GOTOOLCHAIN' => 'local',
   }
 
   prom_version = Prometheus::VersionFlags.new(version)

config/software/pgbouncer-exporter.rb

@@ -37,6 +37,7 @@
   env = {
     'GOPATH' => "#{Omnibus::Config.source_dir}/pgbouncer-exporter",
     'GO111MODULE' => 'on',
+    'GOTOOLCHAIN' => 'local',
   }
   prom_version = Prometheus::VersionFlags.new(version)
 

config/software/postgres-exporter.rb

@@ -34,6 +34,7 @@
 build do
   env = {
     'GOPATH' => "#{Omnibus::Config.source_dir}/postgres-exporter",
+    'GOTOOLCHAIN' => 'local',
   }
 
   prom_version = Prometheus::VersionFlags.new(version)

config/software/prometheus.rb

@@ -39,6 +39,7 @@
   env = {
     'GOPATH' => prometheus_source_dir,
     'GO111MODULE' => 'on',
+    'GOTOOLCHAIN' => 'local',
   }
 
   prom_version = Prometheus::VersionFlags.new(version)

config/software/redis-exporter.rb

@@ -34,6 +34,7 @@
   env = {
     'GOPATH' => "#{Omnibus::Config.source_dir}/redis-exporter",
     'GO111MODULE' => 'on',
+    'GOTOOLCHAIN' => 'local',
   }
 
   ldflags = [