Housekeeping

- Update README
- Run shellcheck on .sh files
- Add helper scripts
- Remove eirene vm variant
- Add post-install checklist

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

scripts/add-user.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+
+if [[ "$#" -ne 2 ]]; then
+  echo "Usage: $0 <user> <sops-master-key>"
+  exit 1
+fi
+
+USER="$1"
+
+mkdir -p "./users/${USER}/secrets"
+
+nix shell nixpkgs#age --command age-keygen -o "./users/${USER}/secrets/key.txt"
+
+AGE_KEY=$(grep "^# public key: " "./users/${USER}/secrets/key.txt" | sed "s/# public key: //")
+
+for SOPS_FILE in $(find . -type f -name "sops.yaml"); do
+  sed -i "/- users:/a\    - &${USER} ${AGE_KEY}" "${SOPS_FILE}"
+  sed -i "/- age:/a\        - *${USER}" "${SOPS_FILE}"
+done
+
+"$(dirname "$0")/update-keys.sh" "$2"
+
+echo "User ${USER} has been successfully added."