Adjust SSH config with action-upterm (#1030)

* Experimentally add upterm action

* Move upterm action to original ssh dir and lightweight job

* Make controlPath shorter

* Add uptermd.upterm.dev in known_hosts

* Revert experimental actions from linter workflow

config/ssh/known_hosts

@@ -11,6 +11,8 @@
 #   - https://bitbucket.org/site/ssh
 #   - https://github.com/tmate-io/tmate/issues/262#issue-1189996622
 
+# How to get these entry?: `ssh-keyscan "$hostname"`
+
 github.com ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIOMqqnkVzrm0SdG6UOoqKLsabgH5C9okWi0dh2l9GKJl
 github.com ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBEmKSENjQEezOmxkZMy7opKgwFB9nkt5YRrYMjNuG5N87uRgg6CLrbo5wAdT/y6v0mKV0U2w0WZ2YB/++Tpockg=
 github.com ssh-rsa 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
@@ -20,6 +22,11 @@ gitlab.com ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAA
 bitbucket.org ssh-rsa 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
 bitbucket.org ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBPIQmuzMBuKdWeF4+a2sjSSpBK0iqitSQ+5BM9KhpexuGt20JpTVM7u5BDZngncgrqDMbWdxMWWOGtZ9UgbqgZE=
 bitbucket.org ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIIazEu89wgQZ4bqs3d63QSMzYVa0MuJ2e2gKTKqu+UUO
+
+# Public upterm and/or tmate hosts should be here for debugging purpose
+
+uptermd.upterm.dev ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAICiecex8Dq718eSe1CCLgLvDmI7AagvCtax7brPFWkh4
+
 nyc1.tmate.io ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDTnCMAanvAYXe8RSbSgpz2agNiU2i2Y2ryPWeFx+yh473Aj0zW6x/BzApOn5k4qiPmf8LOVSIk5hL01W8l2y5yHC2CXFyBpQuc/uNZzLpAxrvTSVN1rp7hu3dR5keybHFdd8SEWlPI4m9vPYUVqXMrXBjfsSZxeYOUKNav3aWWPGtO19KhmCdMbIZx3PN0QvklhkJ2ElRZO7uiACvvCWS8LOo3ht/Y6QdGIfQqTX3DJlFXwfvnoqhlmV8LGVKk/y6jtqPmmengEEHtvRcH92LzBIR5e0NQj+5/WDHquh1p9xiaA3TZD6zStWSrbqFovm7aAAM9WKfb866WkUK1HlNv
 sfo2.tmate.io ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDTnCMAanvAYXe8RSbSgpz2agNiU2i2Y2ryPWeFx+yh473Aj0zW6x/BzApOn5k4qiPmf8LOVSIk5hL01W8l2y5yHC2CXFyBpQuc/uNZzLpAxrvTSVN1rp7hu3dR5keybHFdd8SEWlPI4m9vPYUVqXMrXBjfsSZxeYOUKNav3aWWPGtO19KhmCdMbIZx3PN0QvklhkJ2ElRZO7uiACvvCWS8LOo3ht/Y6QdGIfQqTX3DJlFXwfvnoqhlmV8LGVKk/y6jtqPmmengEEHtvRcH92LzBIR5e0NQj+5/WDHquh1p9xiaA3TZD6zStWSrbqFovm7aAAM9WKfb866WkUK1HlNv
 sgp1.tmate.io ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDTnCMAanvAYXe8RSbSgpz2agNiU2i2Y2ryPWeFx+yh473Aj0zW6x/BzApOn5k4qiPmf8LOVSIk5hL01W8l2y5yHC2CXFyBpQuc/uNZzLpAxrvTSVN1rp7hu3dR5keybHFdd8SEWlPI4m9vPYUVqXMrXBjfsSZxeYOUKNav3aWWPGtO19KhmCdMbIZx3PN0QvklhkJ2ElRZO7uiACvvCWS8LOo3ht/Y6QdGIfQqTX3DJlFXwfvnoqhlmV8LGVKk/y6jtqPmmengEEHtvRcH92LzBIR5e0NQj+5/WDHquh1p9xiaA3TZD6zStWSrbqFovm7aAAM9WKfb866WkUK1HlNv

home-manager/ssh.nix

@@ -58,6 +58,11 @@ in
 
     controlMaster = "auto";
     controlPersist = "10m";
+    # Used %r by default. And it makes `ControlPath too long` especially using upterm.
+    # See following resources and GH-1030
+    # https://github.com/nix-community/home-manager/blob/20665c6efa83d71020c8730f26706258ba5c6b2a/modules/programs/ssh.nix#L424-L430
+    # https://github.com/owenthereal/upterm/issues/283#issuecomment-2508582116
+    controlPath = "~/.ssh/master-%C@%n:%p";
 
     addKeysToAgent = "yes";