test: load env variables so npm test works locally (#742)

We [set environment variables in CI][0] so that `npm test` works, but it
doesn't work locally because Jest isn't loading them.

This loads them when running Jest.

[0]: https://github.com/digidem/comapeo-mobile/blob/9b6cf8f71a0d960174c7e8cd5ce1b6bb8f1dd5a7/.github/workflows/ci.yml#L72-L75

Co-Authored-By: Gregor MacLennan <[email protected]>

package.json

@@ -10,7 +10,7 @@
     "ios-no-backend-rebuild": "expo run:ios",
     "prestart": "npm run build:translations && npm run build:intl-polyfills",
     "start": "expo start",
-    "test": "jest",
+    "test": "dotenv jest",
     "lint:prettier": "prettier \"src/**/*.{js,ts,jsx,tsx}\" --check",
     "lint:eslint": "eslint . --ext .js,.jsx,.ts,.tsx --cache --ignore-path .gitignore",
     "lint:types": "tsc --noEmit",
@@ -143,6 +143,7 @@
     "babel-jest": "^29.6.3",
     "babel-plugin-transform-inline-environment-variables": "^0.4.4",
     "date-fns": "^3.6.0",
+    "dotenv-cli": "^7.4.2",
     "eslint": "^8.19.0",
     "eslint-config-prettier": "^9.1.0",
     "execa": "^8.0.1",