add ssh client

.devcontainer/Dockerfile

 FROM alpine:latest
 RUN apk update && \
     apk upgrade && \
-    apk add nodejs yarn php8 php8-mysqli php8-mbstring git nano composer && \
+    apk add nodejs yarn php8 php8-mysqli php8-mbstring git nano composer openssh-client && \
     echo "alias php=php8" >> /etc/profile
 
 ENV ENV="/etc/profile"
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