Add script to retrieve SSL certificates with s_client.

dotfiles/zshrc.d/ssl.zsh

@@ -0,0 +1,8 @@
+retrieve_ssl_certificate_chain() {
+  openssl s_client -connect $1 -showcerts < /dev/null | awk \
+    ' BEGIN { incert = 0 }
+      /-----BEGIN CERTIFICATE-----/ { incert = 1 }
+      incert == 1 { print $0 }
+      /-----END CERTIFICATE-----/ { incert = 0 }
+    ' 2>/dev/null
+}