fixed issue where the server wouldnt start on second boot

Dockerfile

@@ -47,11 +47,21 @@ EXPOSE ${PORT}/udp
 VOLUME ["/data"]
 
 ENTRYPOINT ["/bin/bash", "-c", "\
+if [ ! -f ${DATADIR}/hlds_run ]; then \
+    echo 'Installing Counter-Strike server...'; \
     ${STEAMCMDDIR}/steamcmd.sh +force_install_dir ${DATADIR} +login anonymous \
     +app_set_config 90 mod cstrike \
     +app_update 90 validate \
-    +app_update 70 validate \
-    +app_update 10 validate \
-    +quit && \
-    cd ${DATADIR} && \
-    exec bash hlds_run -game cstrike -console +ip 0.0.0.0 -port ${PORT} +map ${MAP}"]
+    +quit; \
+else \
+    if [ \"$UPDATE\" = \"1\" ]; then \
+        echo 'Updating Counter-Strike server...'; \
+        ${STEAMCMDDIR}/steamcmd.sh +force_install_dir ${DATADIR} +login anonymous \
+        +app_update 90 validate \
+        +quit; \
+    else \
+        echo 'Skipping update, starting server...'; \
+    fi; \
+fi; \
+cd ${DATADIR} && \
+exec bash hlds_run -game cstrike -console +ip 0.0.0.0 -port ${PORT} +map ${MAP}"]