chore(config): rename FIREWALL to FIREWALL_ENABLED_DISABLING_IT_SHOOTS_YOU_IN_YOUR_FOOT

Dockerfile

@@ -145,7 +145,7 @@ ENV VPN_SERVICE_PROVIDER=pia \
     # # PIA only:
     PORT_FORWARD_ONLY= \
     # Firewall
-    FIREWALL=on \
+    FIREWALL_ENABLED_DISABLING_IT_SHOOTS_YOU_IN_YOUR_FOOT=on \
     FIREWALL_VPN_INPUT_PORTS= \
     FIREWALL_INPUT_PORTS= \
     FIREWALL_OUTBOUND_SUBNETS= \

internal/configuration/settings/firewall.go

@@ -129,7 +129,7 @@ func (f *Firewall) read(r *reader.Reader) (err error) {
 		return err
 	}
 
-	f.Enabled, err = r.BoolPtr("FIREWALL")
+	f.Enabled, err = r.BoolPtr("FIREWALL_ENABLED_DISABLING_IT_SHOOTS_YOU_IN_YOUR_FOOT")
 	if err != nil {
 		return err
 	}