Added SSH server for JetBrains Gateway with Codespaces. (#7592)

.devcontainer/dockerfile

@@ -8,7 +8,21 @@ RUN apt-get update && apt-get install -y \
     curl \
     gnupg2 \
     lsb-release \
-    software-properties-common
+    software-properties-common \
+    openssh-server
+
+# Configure SSH server
+RUN mkdir /var/run/sshd \
+    && echo 'root:Docker!' | chpasswd \
+    && sed -i 's/#PermitRootLogin prohibit-password/PermitRootLogin yes/' /etc/ssh/sshd_config \
+    && sed -i 's@session    required     pam_loginuid.so@session    optional     pam_loginuid.so@g' /etc/pam.d/sshd \
+    && echo "export VISIBLE=now" >> /etc/profile
+
+# Expose SSH port
+EXPOSE 22
+
+# Start SSH service
+CMD ["/usr/sbin/sshd", "-D"]
 
 # Install .NET SDKs (6, 7, 8 and 9)
 RUN wget https://dot.net/v1/dotnet-install.sh -O dotnet-install.sh \
@@ -42,4 +56,4 @@ RUN curl -sL https://packages.microsoft.com/keys/microsoft.asc | gpg --dearmor |
 # Clean up
 RUN rm dotnet-install.sh \
     && apt-get clean \
-    && rm -rf /var/lib/apt/lists/*
+    && rm -rf /var/lib/apt/lists/*