fix: change ldflags

PKGBUILD

@@ -11,8 +11,34 @@ makedepends=('go')
 source=("https://github.com/christian-korneck/docker-pushrm/archive/v${pkgver}.zip")
 sha512sums=('aef19964c740b4d9b512b696759cd4b31793ced91f066864e534242d74694a796ee9930a809c2b5a6779238e32572642ab05fa5a7f8cf1062d0a9dd5f40c52d8')
 
+prepare() {
+  cd ${srcdir}/${pkgname}-${pkgver}
+
+  export GOPATH="${srcdir}"
+
+  env | sort | grep -E '^C?GO'
+
+  go mod download -modcacherw
+}
+
 build() {
-  cd ${srcdir}/${pkgname}-${pkgver} && go build
+  cd ${srcdir}/${pkgname}-${pkgver}
+
+  # https://wiki.archlinux.org/title/Go_package_guidelines
+  export CGO_CPPFLAGS="${CPPFLAGS}"
+  export CGO_CFLAGS="${CFLAGS}"
+  export CGO_CXXFLAGS="${CXXFLAGS}"
+  export CGO_LDFLAGS="${LDFLAGS}"
+  export GOPATH="${srcdir}"
+
+  go build \
+    -trimpath \
+    -buildmode=pie \
+    -mod=readonly \
+    -modcacherw \
+    -ldflags "-linkmode external" \
+    -o $pkgname \
+    .
 }
 
 package() {