ci: Import ci pipeline from original repo

When this repository was split from the original *dustin/sshca*
repository, the CI pipeline was not imported.  It wouldn't have mattered
if it had been, since it wouldn't have worked, anyway, given the path
changes.

ci/podTemplate.yaml

@@ -0,0 +1,19 @@
+spec:
+  containers:
+  - name: buildah
+    image: quay.io/containers/buildah:v1
+    command:
+    - cat
+    stdin: true
+    tty: true
+    securityContext:
+      capabilities:
+        add:
+        - SYS_ADMIN
+        - MKNOD
+        - SYS_CHROOT
+        - SETFCAP
+    resources:
+      limits:
+        github.com/fuse: 1
+  hostUsers: false