chore!(amneziawg): refactor to be separate from wireguard

- amneziawg is now a VPN protocol and no longer a Wireguard implementation
- Use it with VPN_TYPE=amneziawg
- document AMNEZIAWG_* options in Dockerfile
- document amneziawg support in readme
- separate amneziawg settings and code from wireguard
- re-use code from wireguard whenever possible

Dockerfile

@@ -112,6 +112,36 @@ ENV VPN_SERVICE_PROVIDER=pia \
     WIREGUARD_ADDRESSES_SECRETFILE=/run/secrets/wireguard_addresses \
     WIREGUARD_MTU= \
     WIREGUARD_IMPLEMENTATION=auto \
+    # Amnezia
+    AMNEZIAWG_ENDPOINT_IP= \
+    AMNEZIAWG_ENDPOINT_PORT= \
+    AMNEZIAWG_CONF_SECRETFILE=/run/secrets/wg0.conf \
+    AMNEZIAWG_PRIVATE_KEY= \
+    AMNEZIAWG_PRIVATE_KEY_SECRETFILE=/run/secrets/wireguard_private_key \
+    AMNEZIAWG_PRESHARED_KEY= \
+    AMNEZIAWG_PRESHARED_KEY_SECRETFILE=/run/secrets/wireguard_preshared_key \
+    AMNEZIAWG_PUBLIC_KEY= \
+    AMNEZIAWG_ALLOWED_IPS= \
+    AMNEZIAWG_PERSISTENT_KEEPALIVE_INTERVAL=0 \
+    AMNEZIAWG_ADDRESSES= \
+    AMNEZIAWG_ADDRESSES_SECRETFILE=/run/secrets/wireguard_addresses \
+    AMNEZIAWG_MTU= \
+    AMNEZIAWG_JC=0 \
+    AMNEZIAWG_JMIN=0 \
+    AMNEZIAWG_JMAX=0 \
+    AMNEZIAWG_S1=0 \
+    AMNEZIAWG_S2=0 \
+    AMNEZIAWG_S3=0 \
+    AMNEZIAWG_S4=0 \
+    AMNEZIAWG_H1= \
+    AMNEZIAWG_H2= \
+    AMNEZIAWG_H3= \
+    AMNEZIAWG_H4= \
+    AMNEZIAWG_I1= \
+    AMNEZIAWG_I2= \
+    AMNEZIAWG_I3= \
+    AMNEZIAWG_I4= \
+    AMNEZIAWG_I5= \
     # Wireguard AmneziaWG userspace obfuscation (requires WIREGUARD_IMPLEMENTATION=amneziawg)
     AMNEZIAWG_JC=0 \
     AMNEZIAWG_JMIN=0 \