git-secret-init - initializes a git-secret repo by setting up a .gitsecret directory.
git-secret-init should be run inside a git repo, to create the .gitsecret directory and initialize the
repo for git-secret. Until a repository is initialized with gitsecretinit, all other git-secret
commands are unavailable.
If a .gitsecret directory already exists, git-secret-init exits without making any changes. Otherwise,
• .gitignore is modified to ignore git-secret´s random_seed_file, and to not ignore .secret files,
• a .gitsecret directory is created with the sub-directories /keys and /paths,
• The .gitsecret/keys subdirectory permission is set to 700 to make gnupg happy.
See git-secret(7) https://git-secret.io/git-secret for information about renaming the .gitsecret folder
with the SECRETS_DIR environment variable, and changing the extension git-secret uses for secret files
with the SECRETS_EXTENSION environment variable.