feat(infra): add S3 declarative buckets

A very simple basic support for it, which requires a S3 admin token.

Signed-off-by: Ryan Lahfa <ryan@dgnum.eu>

default.nix

@@ -97,11 +97,31 @@ in
           ln -snf ${terranixConfigFile} config.tf.json
           exec ${pkgs.lib.getExe pkgs.opentofu} "$@"
         '')
+        (pkgs.writeShellScriptBin "decryptAndSourceEnvironment" ''
+          set -eo pipefail
+
+          # TODO: don't hardcode me.
+          SECRET_FILE=".credentials/admin-environment.age"
+          IDENTITIES=()
+          for identity in [ "$HOME/.ssh/id_ed25519" "$HOME/.ssh/id_rsa" ]; do
+            test -r "$identity" || continue
+            IDENTITIES+=(-i)
+            IDENTITIES+=("$identity")
+          done
+
+          test "''${#IDENTITIES[@]}" -eq 0 && echo "[agenix-shell] WARNING: no readable identities found!"
+
+          test -f "$SECRET_FILE" || echo "[agenix-shell] WARNING: encrypted environment file $SECRET_FILE not found!"
+          export eval $(${pkgs.lib.getExe pkgs.rage} --decrypt "''${IDENTITIES[@]}" -o - $SECRET_FILE)
+
+          echo "[agenix-shell] Repository-wide secrets loaded in the environment."
+        '')
         (pkgs.nixos-generators.overrideAttrs (_: {
           version = "1.8.0-unstable";
           src = builtins.storePath sources.nixos-generators;
         }))
         pkgs.npins
+        pkgs.rage
 
         (pkgs.callPackage ./lib/colmena { inherit (nix-pkgs) colmena; })
         (pkgs.callPackage "${sources.agenix}/pkgs/agenix.nix" { })
@@ -111,6 +131,8 @@ in
 
       shellHook = ''
         ${git-checks.shellHook}
+        # If we want to export these environments, we need to source it, not call it.
+        source $(which decryptAndSourceEnvironment)
       '';
 
       preferLocalBuild = true;