Automate provisioning and deployment of VPS

In order to perform that I had to remove Terraform's =.tfstate= files from the
repository. Terraform does support "backends" for storing the state files, but I
settled for storing it on a separate repo (vps-state).

For now it solves the state management problem:
- it has history of states;
- all state files are GPG encrypted;
- there's no coordination however, but only the CI should perform a deploy in
order to avoid race conditions.

I had to add GPG and SSH keys to sr.ht to achieve that:
- SSH public key to my profile to authorize it to push to vps-state repo;
- SSH private key to the secret builds.sr.ht environment to enable push to the
repository from the pipeline;
- GPG public key to git-crypt to make it possible for the pipeline to unlock the
encrypted content;
- GPG private key to the secret builds.sr.ht environment to enable decrypting
git-crypt content from the pipeline.

In order to avoid divergent environment from local and CI, the ./provision.sh
script is ran through nix-shell.

1 files changed, 2 insertions, 1 deletions

diff --git a/default.nix b/default.nix
index c7c5bc4..67830e2 100644
--- a/default.nix
+++ b/default.nix
@@ -95,8 +95,9 @@ with pkgs.stdenv; rec {
       touch $out
     '';
   });
+  # Used in .build.yml to run ./provision.sh
   shell = mkShell rec {
     name = "vps-shell";
-    buildInputs = [ nixfmt terraform-full ];
+    buildInputs = [ terraform terraform-providers.digitalocean git-crypt ];
   };
 }