test: introduce SSH based CI for non-native test hosts (#644)

* feat: ssh based CI

Signed-off-by: Xe Iaso <me@xeiaso.net>

* test: implement SSH ci with caches and github actions

Signed-off-by: Xe Iaso <me@xeiaso.net>

* test(ssh-ci): fix known hosts secret

Signed-off-by: Xe Iaso <me@xeiaso.net>

* test(ssh-ci): clone the repo, that's important

Signed-off-by: Xe Iaso <me@xeiaso.net>

* chore: spelling

Signed-off-by: Xe Iaso <me@xeiaso.net>

* test(ssh-ci): speed up ci by prebaking the SSH CI image

Signed-off-by: Xe Iaso <me@xeiaso.net>

* test(ssh-ci): set -euo

Signed-off-by: Xe Iaso <me@xeiaso.net>

* test(ssh-ci): enable pull_request_target so things work

Signed-off-by: Xe Iaso <me@xeiaso.net>

* chore: spelling

Signed-off-by: Xe Iaso <me@xeiaso.net>

* test(ssh-ci): oh goody it's broken

Signed-off-by: Xe Iaso <me@xeiaso.net>

* test(ssh-ci): add cronjob to rebuild ci runner image

Signed-off-by: Xe Iaso <me@xeiaso.net>

* test(ssh-ci): also run yeet

Signed-off-by: Xe Iaso <me@xeiaso.net>

* test(ssh-ci): force git version for yeet

Signed-off-by: Xe Iaso <me@xeiaso.net>

* test(ssh-ci): run set -x in the container

Signed-off-by: Xe Iaso <me@xeiaso.net>

* test(ssh-ci): fix yeet?

Signed-off-by: Xe Iaso <me@xeiaso.net>

* test(ssh-ci): remove yeet for now

Signed-off-by: Xe Iaso <me@xeiaso.net>

* test(ssh-ci): disable for PRs for now

Signed-off-by: Xe Iaso <me@xeiaso.net>

---------

Signed-off-by: Xe Iaso <me@xeiaso.net>

.github/actions/spelling/expect.txt

@@ -6,6 +6,7 @@ amazonbot
 anthro
 anubis
 anubistest
+apk
 Applebot
 archlinux
 badregexes
@@ -68,6 +69,7 @@ duckduckbot
 eerror
 ellenjoe
 enbyware
+euo
 everyones
 evilbot
 evilsite
@@ -117,6 +119,7 @@ imgproxy
 inp
 iss
 isset
+itv
 ivh
 Jenomis
 JGit
@@ -246,6 +249,7 @@ traefik
 uberspace
 unixhttpd
 unmarshal
+uuidgen
 uvx
 UXP
 Varis