fix(skills-init): install openssh-client so ssh-keyscan is available

the skills-init image runs ssh-keyscan to populate ~/.ssh/known_hosts when
an agent uses ssh-based git auth (gitAuthSecretRef -> kubernetes.io/ssh-auth).
the alpine base only had git, so the binary was missing and the init container
exited with 'ssh-keyscan: not found' under set -e, leaving the agent pod in
crashloopbackoff.

add openssh-client to the apk install list and verify ssh-keyscan resolves at
build time so the same regression cannot ship silently again.

closes #1770

Signed-off-by: SarthakB11 <sarthak.bhardwaj21b@iiitg.ac.in>

Author: SarthakB11

docker/skills-init/Dockerfile

@@ -17,7 +17,13 @@ FROM alpine:3.23
 ARG PYTHON_UID=1001
 ARG PYTHON_GID=1001
 
-RUN apk upgrade --no-cache && apk add --no-cache git
+RUN apk upgrade --no-cache && apk add --no-cache git openssh-client
+
+# ssh-keyscan is required by skills-init.sh when an Agent uses SSH-based git
+# auth (gitAuthSecretRef -> kubernetes.io/ssh-auth). Verify it is on PATH so a
+# future package change cannot silently reintroduce the missing-binary regression.
+RUN command -v ssh-keyscan >/dev/null
+
 COPY --from=krane-builder /build/krane /usr/local/bin/krane
 
 # Run as the same UID/GID as the main agent container (python user) so that