Add deb package and nightly distribution (#1977)

- Add publishing automated debian package releases via Cloudsmith.io, which allows evcc to be installed and updated via `apt`
- Add nightly docker (:latest) and deb distribution
- Disable docker builds for every commit on master
- Allow nightly builds to be triggered manually

packaging/init/evcc.service

@@ -0,0 +1,17 @@
+# evcc.service
+#
+
+[Unit]
+Description=evcc
+Requires=network-online.target
+After=syslog.target network.target network-online.target
+Wants=network-online.target
+StartLimitIntervalSec=10
+StartLimitBurst=10
+
+[Service]
+ExecStart=/usr/local/bin/evcc --log error
+Restart=always
+
+[Install]
+WantedBy=multi-user.target