improving bash

- i shouldve read thru it

src/security.sh

@@ -2,7 +2,7 @@
 
 set -eo pipefail
 
-if [ "$STATIC_FLAG" == "no" && "$VULN_CHECK" == "no" ]; then
+if [[ "$STATIC_FLAG" == "no" && "$VULN_CHECK" == "no" ]]; then
     echo "[INFO] no security flags set, skipping!";
     exit 0;
 fi
@@ -13,16 +13,16 @@ echo "[DEBUG] $toolchain found in go.mod";
 version=$(go env -json | jq -r ".GOVERSION");
 echo "[DEBUG] $version found in go env";
 
-if [ ! -z "$toolchain" ]; then
+if [[ -n "$toolchain" ]]; then
     echo "[DEBUG] overwriting version with toolchain";
     version=$toolchain;
 fi
 
-if [ "$STATIC_FLAG" == "yes" ]; then
+if [[ "$STATIC_FLAG" == "yes" ]]; then
     if GOTOOLCHAIN=$version gosec ./...; then
         echo "[INFO] gosec passed!";
     else
-        if [ "$STATIC_FAIL" == "yes" ]; then
+        if [[ "$STATIC_FAIL" == "yes" ]]; then
             echo "[FATAL] gosec failed!";
             exit 1;
         else