Add LDFLAGS taskfile variable to build command

Even though the project does not have any such flags at the moment, this is the established format of the "template"
project assets, so adding it will facilitate syncs with the upstream assets.

Author: per1234

Taskfile.yml

@@ -7,6 +7,7 @@ vars:
   DEFAULT_GO_PACKAGES:
     sh: |
       echo $(cd {{default .DEFAULT_GO_MODULE_PATH .GO_MODULE_PATH}} && go list ./... | tr '\n' ' ' || echo '"ERROR: Unable to discover Go packages"')
+  LDFLAGS:
 
 tasks:
   build:
@@ -36,7 +37,7 @@ tasks:
     desc: Build the Go code
     dir: "{{.DEFAULT_GO_MODULE_PATH}}"
     cmds:
-      - go build -v -o libraries-repository-engine{{exeExt}}
+      - go build -v -o libraries-repository-engine{{exeExt}} {{.LDFLAGS}}
 
   # Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/assets/test-go-task/Taskfile.yml
   go:test: