ejsonDecrypt filePath
ejsonDecrypt returns the decrypted content of an
ejson-encrypted file.
filePath indicates where the encrypted file is located.
The decrypted file is cached so calling ejsonDecrypt multiple
times with the same filePath will only run through the decryption
process once. The cache is shared with ejsonDecryptWithKey.
Example
{{ (ejsonDecrypt "my-secrets.ejson").password }}