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/workflows/ssh-ci-runner-cron.yml

@@ -0,0 +1,36 @@
+name: Regenerate ssh ci runner image
+
+on:
+  # pull_request:
+  #   branches: ["main"]
+  schedule:
+    - cron: "0 0 1,8,15,22 * *"
+  workflow_dispatch:
+
+permissions:
+  pull-requests: write
+  contents: write
+  packages: write
+
+jobs:
+  ssh-ci-rebuild:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        with:
+          fetch-tags: true
+          fetch-depth: 0
+          persist-credentials: false
+      - name: Log into registry
+        uses: docker/login-action@343f7c4344506bcbf9b4de18042ae17996df046d # v3.0.0
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@b5ca514318bd6ebac0fb2aedd5d36ec1b5c232a2 # v3.10.0
+      - name: Build and push
+        run: |
+          cd ./test/ssh-ci
+          docker buildx bake --push