Add extra flags to linux build scripts

Author: AgustinSRG

backend/build-production.sh

@@ -1,3 +1,3 @@
 #!/bin/sh
 
-go build -ldflags="-s -w" -o pmvd
+CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags="-s -w" -o pmvd

backup-tool/build-production.sh

@@ -1,3 +1,3 @@
 #!/bin/sh
 
-go build -ldflags="-s -w" -o pmv-backup
+CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags="-s -w" -o pmv-backup

launcher/build-production.sh

@@ -1,3 +1,3 @@
 #!/bin/sh
 
-go build -ldflags="-s -w" -o pmv
+CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags="-s -w" -o pmv