Make the Let's Encrypt email configurable

Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>

Makefile.am

@@ -34,7 +34,9 @@ guix-commit.txt: Makefile
 	sed 's#DOMAIN#$(DOMAIN)#g' $< > $@
 
 %.scm: %.scm.tmpl guix-commit.txt Makefile
-	sed 's#DOMAIN#$(DOMAIN)#g' $< > $@
+	sed \
+		"s#DOMAIN#$(DOMAIN)#g ; \
+		s#LETSENCRYPT_EMAIL#$(LETSENCRYPT_EMAIL)#g" $< > $@
 
 IMAGE_SOURCE = \
 	guix-commit.txt \

configure.ac

@@ -24,6 +24,7 @@ AC_CHECK_PROG([GUIX], [guix], [guix])
 AC_CHECK_PROG([SED], [sed], [sed])
 
 AC_SUBST([DOMAIN], [])
+AC_SUBST([LETSENCRYPT_EMAIL], [])
 
 AC_ARG_WITH([domain],
   [AS_HELP_STRING([--with-domain=DOMAIN],
@@ -31,10 +32,18 @@ AC_ARG_WITH([domain],
   [DOMAIN=$withval],
   [DOMAIN=audio.experimental.a-lec.org])
 
+AC_ARG_WITH([letsencrypt-email],
+  [AS_HELP_STRING([--with-letsencrypt-email=LETSENCRYPT_EMAIL], [Use
+  custom email address for Let's Encrypt registration and recovery
+  contact. (default=cominfra@a-lec.org)])],
+  [LETSENCRYPT_EMAIL=$withval],
+  [LETSENCRYPT_EMAIL=cominfra@a-lec.org])
+
 AC_CONFIG_FILES([Makefile])
 AC_OUTPUT
 
 echo
 echo "Configuration options:"
 echo "======================"
-echo "- domain: $DOMAIN"
+echo "- Domain: $DOMAIN"
+echo "- Let's Encrypt email: $LETSENCRYPT_EMAIL"

mumble-vm-system.scm.tmpl

@@ -86,7 +86,7 @@ replicate or contribute to it.")
       (service
        certbot-service-type
        (certbot-configuration
-        (email "cominfra@a-lec.org")
+        (email "LETSENCRYPT_EMAIL")
         (certificates
          (list
           (certificate-configuration