Add support for External Account Binding with ACME

Allows for the support of External Account Binding to request SSL
Certificates through a provider that supports EAB and ACME.

Some example providers include InCommon and ZeroSSL

docker-compose.acme.yml

@@ -28,6 +28,9 @@ services:
       - --certificatesresolvers.myresolver.acme.email=${[email protected]}
       - --certificatesresolvers.myresolver.acme.storage=/acme/acme.json
       - --certificatesResolvers.myresolver.acme.caServer=${ACME_SERVER-https://acme-v02.api.letsencrypt.org/directory}
+      - --certificatesresolvers.myresolver.acme.certificatesduration=${ACME_CERT_DURATION-2160}
+      - --certificatesresolvers.myresolver.acme.eab.kid=${ACME_EAB_KID-}
+      - --certificatesresolvers.myresolver.acme.eab.hmacencoded=${ACME_EAB_HMAC-}
     volumes:
       - ./acme:/acme:rw
   cantaloupe:

sample.env

@@ -41,6 +41,13 @@ USE_ACME=false
 # Specify email to tie SSL Certificate to with ACME provider
 ACME_EMAIL=[email protected]
 
+# ACME Defaults for Let's Encrypt Service
+# ACME_SERVER=https://acme-v02.api.letsencrypt.org/directory
+# Default duration for the certificate is 90 days or 2,160 hours for Let's Encrypt
+# ACME_CERT_DURATION=2160
+# ACME_EAB_KID=
+# ACME_EAB_HMAC=
+
 # Includes `watchtower` as a service.
 INCLUDE_WATCHTOWER_SERVICE=false