use env based credentials first for docker

Signed-off-by: Prabhu Subramanian <prabhu@appthreat.com>

docker.js

@@ -46,6 +46,9 @@ if (
   isContainerd = true;
 }
 
+// Cache the registry auth keys
+const registry_auth_keys = {};
+
 /**
  * Method to get all dirs matching a name
  *
@@ -1084,6 +1087,9 @@ export const removeImage = async (fullImageName, force = false) => {
 };
 
 export const getCredsFromHelper = (exeSuffix, serverAddress) => {
+  if (registry_auth_keys[serverAddress]) {
+    return registry_auth_keys[serverAddress];
+  }
   let credHelperExe = `docker-credential-${exeSuffix}`;
   if (isWin) {
     credHelperExe = credHelperExe + ".exe";
@@ -1098,7 +1104,12 @@ export const getCredsFromHelper = (exeSuffix, serverAddress) => {
   } else if (result.stdout) {
     const cmdOutput = Buffer.from(result.stdout).toString();
     try {
-      return JSON.parse(cmdOutput);
+      const authPayload = JSON.parse(cmdOutput);
+      const authKey = Buffer.from(JSON.stringify(authPayload)).toString(
+        "base64"
+      );
+      registry_auth_keys[serverAddress] = authKey;
+      return authKey;
     } catch (err) {
       return undefined;
     }