added postfix certificate distribution

ssl/create-postfix-certs

@@ -0,0 +1,12 @@
+#!/usr/bin/bash
+export CN=$1
+./create-key $CN
+pushd certs
+# The default algorithm is sha256 with Postfix ≥ 3.6 and the compatibility_level set to 3.6 or higher. 
+# With Postfix ≤ 3.5, the default algorithm is md5.
+# https://www.postfix.org/postconf.5.html#relay_clientcerts
+openssl x509 -in $CN.crt -noout -pubkey | openssl pkey -pubin -outform DER | openssl dgst -md5 -c | ( read D FP; echo $FP $CN ) >>relay_clientcerts
+cp $CN.key ~/kopano-docker/etc-$CN/ssl/private
+cp kopano-ca.crt ~/kopano-docker/etc-$CN/ssl/certs
+cat kopano-ca.crt $CN.crt >~/kopano-docker/etc-$CN/ssl/$CN-full-chain.pem
+popd