Adding example `forge.yml`

examples/forge.yml

+---
+auth:
+  user: root
+  method: ssh
+  key: inline # Looks for `secret` named `key`
+deploy:
+  cmd: |
+       git pull
+       nixos-rebuild switch
+  mirror: /etc/nixos
+secrets:
+  key: |
+        LS0tCml2OiB0WnhMdVJiRWF0Z2luZU0zL2FHM1BYUGpxOEF1UWhtQlhuRWFlRG9raS9scjZ
+        5dUIrRWI0VW1mbFNDNm9SSWVkbGtkWlNZaXIwRnVFZjdpTm1GazFsUT09Cm5vbmNlOiB1U2
+        hOMExMdURIVGFrMXFWWUlaUEVmUS96RjFRSVo2Z29hRUVrZE11V3BiaUxmbjJTMmdMNkcyY
+        mErOWdXazVQaUZMTlN3dnZqT0tZb3VEdkVQZlkzQT09CmRhdGE6IEFFenc5QXVkSWZ1eDNO
+        THVKVGgrSFI4cXB6UmtiOWI5eHBGTTEvUUpiTW02TWM3ZDMybG9WM3lVdzRmK0dGY3B0Q1V
+        kQ0lJN3Q5YkdzNUh1M1p2aURZNzhESWFPaVV6ZU5Rd2lxN2g1TFZGc01mSUVQTks2SFI1cD
+        lsNjNPT20rcGdqdThod2F6UGpEK3hHMFBUQ3BoanhWS1JNNkg3UzF2d0JDRGY1azkvazBQU
+        ThPUGlsSDdLZ1hqWHdBUS9iWk1qQWRRbHAvWWh0TmcxR1ZtTVpjbXhaY2w3b1lNY1E4MFkz
+        R1VKeEpCU1RybDhrSlQ5OUhiNmRaejNTbGdEV215RUlmM1hFZWw3VWkxdUpKakxOdHdqL0l
+        RSWhUZittWU1LQnE3Yk1pTElDaTB3TXh5Zi9JUFFRY0NOYm44dGxWN1d6UHFPbmVtN0FEVj
+        N1L0Y1Z1Q0N25rZ2pSaytseUFCc25wejRteFBHVnhYNGtxNVU1cytlcVVuV3V4YmVnSE10N
+        294L21KZVJZRjJrblNFQjlIS1ZNNXVodVJBNlc2ZXFmWUw3M0g3bEtBc1p0bkdpcGxnWTR5
+        OVpDR0RaOVM1SWV2QVFYbWVadWhUSWVmaVV5MTVXTm5HOUw0REFsUFE1VTlyRTY5aTlPOUJ
+        mRkpFL0todTdPL1hqMEhDOGh4SW5CZzBReTlFRmh2Z0l5aXRPSENLZTJCM3F2ZHlnRnJuU0
+        VaT0FTbUt2NnB4ZlFiMFpzQURaQmMzZz09
\ No newline at end of file