fix: resolve build mode based on package main appearance

further information: https://go.dev/doc/code

templates/gitlab-ci-golang.yml

@@ -55,7 +55,7 @@ variables:
     -mod=readonly
 
   # Default flags for go build linker
-  GO_BUILD_LINKER_FLAGS: "-s -w" 
+  GO_BUILD_LINKER_FLAGS: "-s -w"
 
   # Default packages for 'build' command
   GO_BUILD_PACKAGES: >-
@@ -151,12 +151,12 @@ stages:
   }
 
   function go_build_auto() {
-    log_info "auto build mode, looking up for a \\e[33;1mmain.go\\e[0m file..."
-    found_main_go=$(find ./ -name 'main.go' | wc -l)
-    if [ "${found_main_go}" -eq 0 ]; then
-      go_build_modules
-    else
+    log_info "auto build mode, looking up for a \\e[33;1mmain\\e[0m package..."
+    if grep -Rw --include "*.go" "^package main"
+    then
       go_build_application
+    else
+      go_build_modules
     fi
   }