chore: add miscellaneous config files

files/automatic.conf

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+[commands]
+apply_updates=True
+download_updates=True
+upgrade_type=default
+reboot=when-needed
+
+

files/gvisor-update.service

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+[Unit]
+Description=Update gVisor
+
+[Service]
+Type=oneshot
+RuntimeDirectory=gvisor-updater
+WorkingDirectory=/run/gvisor-updater
+        
+ExecStart=/usr/bin/sleep 5
+ExecStart=curl -sS --remote-name-all 'https://storage.googleapis.com/gvisor/releases/release/latest/x86_64/runsc' 'https://storage.googleapis.com/gvisor/releases/release/latest/x86_64/runsc.sha512'
+ExecStart=sha512sum -c runsc.sha512
+ExecStart=+chown root:root runsc
+ExecStart=+chmod a+rx runsc
+ExecStart=+mv -Z runsc /usr/local/bin/
+
+DynamicUser=true
+CapabilityBoundingSet=
+LockPersonality=true
+MemoryDenyWriteExecute=true
+NoNewPrivileges=true
+PrivateDevices=true
+PrivateIPC=true
+PrivateTmp=true
+ProcSubset=pid
+ProtectClock=true
+ProtectControlGroups=true
+ProtectHome=true
+ProtectHostname=true
+ProtectKernelLogs=true
+ProtectKernelModules=true
+ProtectKernelTunables=true
+ProtectProc=invisible
+ProtectSystem=strict
+RestrictAddressFamilies=
+RestrictNamespaces=true
+RestrictRealtime=true
+RestrictSUIDSGID=true
+RuntimeDirectoryMode=700
+SystemCallArchitectures=native
+SystemCallFilter=@system-service
+SystemCallFilter=~@obsolete
+
+

files/override.conf

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+[Unit]
+Requires=gvisor-update.service
+

files/sshd_config

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+#       $OpenBSD: sshd_config,v 1.104 2021/07/02 05:11:21 dtucker Exp $
+
+# This is the sshd server system-wide configuration file.  See
+# sshd_config(5) for more information.
+
+# This sshd was compiled with PATH=/usr/local/bin:/usr/bin:/usr/local/sbin:/usr/sbin
+
+# The strategy used for options in the default sshd_config shipped with
+# OpenSSH is to specify options with their default value where
+# possible, but leave them commented.  Uncommented options override the
+# default value.
+
+# To modify the system-wide sshd configuration, create a  *.conf  file under
+#  /etc/ssh/sshd_config.d/  which will be automatically included below
+Include /etc/ssh/sshd_config.d/*.conf
+
+# If you want to change the port on a SELinux system, you have to tell
+# SELinux about this change.
+# semanage port -a -t ssh_port_t -p tcp #PORTNUMBER
+#
+#Port 22
+#AddressFamily any
+#ListenAddress 0.0.0.0
+#ListenAddress ::
+IPQoS af21 af11
+
+HostKey /etc/ssh/ssh_host_ed25519_key
+HostKeyAlgorithms ssh-ed25519
+KexAlgorithms sntrup761x25519-sha512@openssh.com
+PubkeyAcceptedKeyTypes ssh-ed25519
+Ciphers aes256-gcm@openssh.com
+MACs -*
+#HostKey /etc/ssh/ssh_host_rsa_key
+#HostKey /etc/ssh/ssh_host_ecdsa_key
+#HostKey /etc/ssh/ssh_host_ed25519_key
+
+# Ciphers and keying
+#RekeyLimit default none
+
+# Logging
+#SyslogFacility AUTH
+#LogLevel INFO
+
+# Authentication:
+
+LoginGraceTime 15s
+#PermitRootLogin prohibit-password
+#StrictModes yes
+MaxAuthTries 1
+#MaxSessions 10
+
+#PubkeyAuthentication yes
+
+# The default is to check both .ssh/authorized_keys and .ssh/authorized_keys2
+# but this is overridden so installations will only check .ssh/authorized_keys
+AuthorizedKeysFile      .ssh/authorized_keys
+
+#AuthorizedPrincipalsFile none
+
+#AuthorizedKeysCommand none
+#AuthorizedKeysCommandUser nobody
+
+# For this to work you will also need host keys in /etc/ssh/ssh_known_hosts
+#HostbasedAuthentication no
+# Change to yes if you don't trust ~/.ssh/known_hosts for
+# HostbasedAuthentication
+#IgnoreUserKnownHosts no
+# Don't read the user's ~/.rhosts and ~/.shosts files
+#IgnoreRhosts yes
+
+# To disable tunneled clear text passwords, change to no here!
+PasswordAuthentication no
+#PermitEmptyPasswords no
+
+# Change to no to disable s/key passwords
+KbdInteractiveAuthentication no
+
+# Kerberos options
+#KerberosAuthentication no
+#KerberosOrLocalPasswd yes
+#KerberosTicketCleanup yes
+#KerberosGetAFSToken no
+#KerberosUseKuserok yes
+
+# GSSAPI options
+#GSSAPIAuthentication no
+#GSSAPICleanupCredentials yes
+#GSSAPIStrictAcceptorCheck yes
+#GSSAPIKeyExchange no
+#GSSAPIEnablek5users no
+
+# Set this to 'yes' to enable PAM authentication, account processing,
+# and session processing. If this is enabled, PAM authentication will
+# be allowed through the KbdInteractiveAuthentication and
+# PasswordAuthentication.  Depending on your PAM configuration,
+# PAM authentication via KbdInteractiveAuthentication may bypass
+# the setting of "PermitRootLogin prohibit-password".
+# If you just want the PAM account and session checks to run without
+# PAM authentication, then enable this but set PasswordAuthentication
+# and KbdInteractiveAuthentication to 'no'.
+# WARNING: 'UsePAM no' is not supported in Fedora and may cause several
+# problems.
+UsePAM yes
+
+AllowAgentForwarding no
+#AllowTcpForwarding yes
+#GatewayPorts no
+#X11Forwarding no
+#X11DisplayOffset 10
+#X11UseLocalhost yes
+#PermitTTY yes
+PrintMotd no
+#PrintLastLog yes
+TCPKeepAlive no
+#PermitUserEnvironment no
+#Compression delayed
+ClientAliveInterval 60
+ClientAliveCountMax 2
+#UseDNS no
+#PidFile /var/run/sshd.pid
+MaxStartups 4096
+#PermitTunnel no
+#ChrootDirectory none
+#VersionAddendum none
+
+# no default banner path
+#Banner none
+
+# override default of no subsystems
+Subsystem       sftp    /usr/libexec/openssh/sftp-server
+
+# Example of overriding settings on a per-user basis
+#Match User anoncvs
+#       X11Forwarding no
+#       AllowTcpForwarding no
+#       PermitTTY no
+#       ForceCommand cvs server