contrib: fix check scripts

Add `set -e` to scripts to exit from a script on error

Author: yukibtc

contrib/check-bindings.sh

@@ -1,5 +1,8 @@
 #!/bin/bash
 
+# Needed to exit from script on error
+set -e
+
 buildargs=(
     "-p nostr-ffi"
     "-p nostr-sdk-ffi"

contrib/check-crates.sh

@@ -1,5 +1,8 @@
 #!/bin/bash
 
+# Needed to exit from script on error
+set -e
+
 # MSRV
 msrv="1.64.0"
 

contrib/check-docs.sh

@@ -1,5 +1,8 @@
 #!/bin/bash
 
+# Needed to exit from script on error
+set -e
+
 buildargs=(
     "-p nostr --all-features"
     "-p nostr-database --all-features"