envsubst: The simplest bash variable substitution tool

🧐 𝗪𝗵𝗮𝘁 𝗶𝘀 𝗲𝗻𝘃𝘀𝘂𝗯𝘀𝘁?envsubst (GNU gettext) streams stdin ➜ stdout, replacing any $VAR with their environment values. Think sed for env-vars, no regex. 🚀 𝗪𝗵𝗲𝗻 𝗱𝗼𝗲𝘀 𝗶𝘁 𝘀𝗵𝗶𝗻𝗲?• Container start-up configs: inject secrets or ...