Fix #261

https://github.com/pelican-eggs/yolks/issues/261

oses/alpine/entrypoint.sh

@@ -34,11 +34,11 @@ 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')
+PARSED=$(echo "$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.
-printf "\033[1m\033[33mcontainer@pelican~ \033[0m%s\n" "$PARSED"
+# Display the command we're running in the output, and then execute it with eval
+printf "\033[1m\033[33mcontainer@pelican~ \033[0m"
+echo "$PARSED"
 # shellcheck disable=SC2086
-exec env ${PARSED}
+eval "$PARSED"