doc: mention SYSTEM_CERTIFICATE_PATH for docker image

Author: srid

doc/howto/direnv.md

@@ -8,10 +8,10 @@ slug: direnv
 
 ## Starship
 
-It is recommended to use [starship](https://starship.rs/) along with nix-direnv, because it gives a visual indication of the current environment. For example, if you are in a `nix develop` shell, your terminal prompt to change to something like this:
+It is recommended to use [starship](https://starship.rs/) along with nix-direnv, because it gives a visual indication of the current environment. For example, if you are in a `nix develop` shell, your terminal prompt automatically changes to something like this:
 
 ```sh
-srid on appreciate haskell-template on  master [!] via λ 9.2.6 via ❄️  impure (ghc-shell-for-haskell-template-0.1.0.0-0-env)
+srid on nixos haskell-template on  master [!] via λ 9.2.6 via ❄️  impure (ghc-shell-for-haskell-template-0.1.0.0-0-env)
 ❯
 ```
 

doc/howto/docker.md

@@ -105,13 +105,17 @@ If you want to tag the images with the commit id of the working copy:
 
 ### SSL certs
 
-In order to be able to make https connections from inside of the docker image, you must expose the cacert Nix package via an environment variable:
+In order to be able to make https connections from inside of the docker image, you must expose the cacert Nix package via the relevant environment variable:
 
 ```nix
 {
   # Inside dockerTools.buildImage
   config = {
-    Env = [ "SSL_CERT_FILE=${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt" ];
+    Env = [ 
+      "SSL_CERT_FILE=${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt" 
+      # Ref: https://hackage.haskell.org/package/x509-system-1.6.7/docs/src/System.X509.Unix.html#getSystemCertificateStore
+      "SYSTEM_CERTIFICATE_PATH=${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt"
+    ];
   };
 }
 ```