add env var to enable and disable collecting all service envelopes

src/mqtt.js

@@ -91,6 +91,7 @@ client.on("message", async (topic, message) => {
         }
 
         // create service envelope in db
+        if(process.env.MM_COLLECT_SERVICE_ENVELOPES === "true"){
             try {
                 await prisma.serviceEnvelope.create({
                     data: {
@@ -107,6 +108,7 @@ client.on("message", async (topic, message) => {
                     envelope: envelope.packet,
                 });
             }
+        }
 
         // attempt to decrypt encrypted packets
         const isEncrypted = envelope.packet.encrypted?.length > 0;