Insert PBKDF2 hash into PostgreSQL container
Because the variables are replaced (with nothing) in bash, the dollars signs need to be escaped:

'PBKDF2\$sha256\$901\$x8mf3JIFTUFU9C23\$ic9J6mFDSz0rETKux/Co9TzCPOX50j+V8Vky5GkY5v0='