feat: externalize e2e testings [skip-release] (#312)

* feat: externalize e2e tests.

* refactor: improve e2e workflow.

* chore: upgrade workflow action version.

* fix: createEnv by adding emptyStringAsUndefined (#317)

* chore: release 1.18.2

---------

Co-authored-by: killian-larcher <killian.larcher@optimusai.fr>
Co-authored-by: Charles GTE <charlesgte31@gmail.com>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

src/env.mjs

@@ -6,6 +6,7 @@ import packageJson from "../package.json" with {type: "json"};
 const {version} = packageJson;
 
 export const env = createEnv({
+    emptyStringAsUndefined: true,
     server: {
         NEXT_PUBLIC_PROJECT_VERSION: z.string().optional(),
 
@@ -199,3 +200,4 @@ export const env = createEnv({
 
     },
 });
+