add .env.example for easier deployment

.env.example

@@ -0,0 +1,33 @@
+# Default mode - intercept live traffic
+PACKMATE_MODE=LIVE
+# Alternative modes:
+# Parse pcap file:
+# PACKMATE_MODE=FILE
+# Just show already captured streams:
+# PACKMATE_MODE=VIEW
+
+# Local IP on network interface or in pcap file to tell incoming packets from outgoing
+PACKMATE_LOCAL_IP=192.168.137.147
+# Username for the web interface
+PACKMATE_WEB_LOGIN=SomeUser
+# Password for the web interface
+PACKMATE_WEB_PASSWORD=SomeSecurePassword
+
+# Settings for PACKMATE_MODE=LIVE
+# Interface to capture on:
+PACKMATE_INTERFACE=eth0
+
+# Settings for PACKMATE_MODE=FILE
+# Name of the file in pcaps directory to parse:
+# PACKMATE_PCAP_FILE=dump.pcap
+
+# Delete old streams (except for those marked favorite). Recommended to keep enabled
+PACKMATE_OLD_STREAMS_CLEANUP_ENABLED=true
+# How often to do the cleanup (best to keep the interval low)
+PACKMATE_OLD_STREAMS_CLEANUP_INTERVAL=5
+# Stream older than this value (in minutes) will be deleted
+PACKMATE_OLD_STREAMS_CLEANUP_THRESHOLD=240
+
+# Optional settings:
+# PACKMATE_DB_PASSWORD=K604YnL3G1hp2RDkCZNjGpxbyNpNHTRb
+# BUILD_TAG=latest