Make the package reproducible

PKGBUILD

@@ -2,7 +2,7 @@
 
 pkgname=prometheus-blackbox-exporter
 pkgver=0.16.0
-pkgrel=3
+pkgrel=4
 pkgdesc="Allows blackbox probing of endpoints over HTTP, HTTPS, DNS, TCP and ICMP"
 arch=('x86_64')
 url="https://github.com/prometheus/blackbox_exporter"
@@ -21,9 +21,10 @@ check() {
 build() {
   cd blackbox_exporter-$pkgver
   go build \
-    -mod=vendor \
-    -gcflags "all=-trimpath=${PWD}" \
-    -asmflags "all=-trimpath=${PWD}" \
+    -trimpath \
+    -buildmode=pie \
+    -mod=readonly \
+    -modcacherw \
     -ldflags "-extldflags ${LDFLAGS} \
       -X github.com/prometheus/common/version.Version=$pkgver \
       -X github.com/prometheus/common/version.Revision=$pkgver \