Remove eval echo "$(cat -)"

Everything still works as normal and this actually fixes complex startup commands as PR #259 was supposed to do

oses/alpine/entrypoint.sh

@@ -34,7 +34,7 @@ cd /home/container || exit 1
 # Convert all of the "{{VARIABLE}}" parts of the command into the expected shell
 # variable format of "${VARIABLE}" before evaluating the string and automatically
 # replacing the values.
-PARSED=$(echo -e ${STARTUP} | sed -e 's/{{/${/g' -e 's/}}/}/g' | eval echo "$(cat -)")
+PARSED=$(echo -e ${STARTUP} | sed -e 's/{{/${/g' -e 's/}}/}/g')
 
 # Display the command we're running in the output, and then execute it with the env
 # from the container itself.