If pem certs are not available

src/freedombone-app-xmpp

     echo 'https_ports = { 5281 }' >> /etc/prosody/prosody.cfg.lua
     echo 'https_interfaces = { "*" }' >> /etc/prosody/prosody.cfg.lua
     echo 'https_ssl = {' >> /etc/prosody/prosody.cfg.lua
-    echo "    certificate = \"/etc/prosody/certs/${DEFAULT_DOMAIN_NAME}.pem\";" >> /etc/prosody/prosody.cfg.lua
+    if [ -f /etc/prosody/certs/${DEFAULT_DOMAIN_NAME}.pem ]; then
+        echo "    certificate = \"/etc/prosody/certs/${DEFAULT_DOMAIN_NAME}.pem\";" >> /etc/prosody/prosody.cfg.lua
+    else
+        echo "    certificate = \"/etc/prosody/certs/${DEFAULT_DOMAIN_NAME}.crt\";" >> /etc/prosody/prosody.cfg.lua
+    fi
     echo "    key = \"/etc/prosody/certs/${DEFAULT_DOMAIN_NAME}.key\";" >> /etc/prosody/prosody.cfg.lua
     echo "    curve = $XMPP_ECC_CURVE;" >> /etc/prosody/prosody.cfg.lua
     echo "    ciphers = $XMPP_CIPHERS;" >> /etc/prosody/prosody.cfg.lua
     echo '' >> /etc/prosody/prosody.cfg.lua
     echo 'ssl = {' >> /etc/prosody/prosody.cfg.lua
     echo "    key = \"/etc/prosody/certs/${DEFAULT_DOMAIN_NAME}.key\";" >> /etc/prosody/prosody.cfg.lua
-    echo "    certificate = \"/etc/prosody/certs/${DEFAULT_DOMAIN_NAME}.pem\";" >> /etc/prosody/prosody.cfg.lua
+    if [ -f /etc/prosody/certs/${DEFAULT_DOMAIN_NAME}.pem ]; then
+        echo "    certificate = \"/etc/prosody/certs/${DEFAULT_DOMAIN_NAME}.pem\";" >> /etc/prosody/prosody.cfg.lua
+    else
+        echo "    certificate = \"/etc/prosody/certs/${DEFAULT_DOMAIN_NAME}.crt\";" >> /etc/prosody/prosody.cfg.lua
+    fi
     echo "    curve = $XMPP_ECC_CURVE;" >> /etc/prosody/prosody.cfg.lua
     echo '    depth = "1";' >> /etc/prosody/prosody.cfg.lua
     echo "    ciphers = $XMPP_CIPHERS;" >> /etc/prosody/prosody.cfg.lua
     echo "VirtualHost \"${DEFAULT_DOMAIN_NAME}\"" >> /etc/prosody/prosody.cfg.lua
     echo '    ssl = {' >> /etc/prosody/prosody.cfg.lua
     echo "        key = \"/etc/prosody/certs/${DEFAULT_DOMAIN_NAME}.key\";" >> /etc/prosody/prosody.cfg.lua
-    echo "        certificate = \"/etc/prosody/certs/${DEFAULT_DOMAIN_NAME}.pem\";" >> /etc/prosody/prosody.cfg.lua
-    echo "    curve = $XMPP_ECC_CURVE;" >> /etc/prosody/prosody.cfg.lua
-    echo '    depth = "1";' >> /etc/prosody/prosody.cfg.lua
-    echo "    ciphers = $XMPP_CIPHERS;" >> /etc/prosody/prosody.cfg.lua
-    echo '    options = {"no_sslv2", "no_sslv3" };' >> /etc/prosody/prosody.cfg.lua
-    echo "    dhparam = \"/etc/prosody/certs/${DEFAULT_DOMAIN_NAME}.dhparam\";" >> /etc/prosody/prosody.cfg.lua
+    if [ -f /etc/prosody/certs/${DEFAULT_DOMAIN_NAME}.pem ]; then
+        echo "        certificate = \"/etc/prosody/certs/${DEFAULT_DOMAIN_NAME}.pem\";" >> /etc/prosody/prosody.cfg.lua
+    else
+        echo "        certificate = \"/etc/prosody/certs/${DEFAULT_DOMAIN_NAME}.crt\";" >> /etc/prosody/prosody.cfg.lua
+    fi
+    echo "        curve = $XMPP_ECC_CURVE;" >> /etc/prosody/prosody.cfg.lua
+    echo '        depth = "1";' >> /etc/prosody/prosody.cfg.lua
+    echo "        ciphers = $XMPP_CIPHERS;" >> /etc/prosody/prosody.cfg.lua
+    echo '        options = {"no_sslv2", "no_sslv3" };' >> /etc/prosody/prosody.cfg.lua
+    echo "        dhparam = \"/etc/prosody/certs/${DEFAULT_DOMAIN_NAME}.dhparam\";" >> /etc/prosody/prosody.cfg.lua
     echo '    }' >> /etc/prosody/prosody.cfg.lua
     echo '' >> /etc/prosody/prosody.cfg.lua
     echo 'Include "conf.d/*.cfg.lua"' >> /etc/prosody/prosody.cfg.lua