feat: add firebase function and cron

.firebaserc

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+{
+  "projects": {
+    "default": "dismoi-29127"
+  }
+}

.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+firebase-debug.log*
+firebase-debug.*.log*
+
+# Firebase cache
+.firebase/
+
+# Firebase config
+
+# Uncomment this if you'd like others to create their own Firebase project.
+# For a team working on the same Firebase project(s), it is recommended to leave
+# it commented so all members can deploy to the same project(s) in .firebaserc.
+# .firebaserc
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env

firebase.json

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+{
+  "functions": {
+    "predeploy": [
+      "npm --prefix \"$RESOURCE_DIR\" run lint"
+    ]
+  },
+  "emulators": {
+    "firestore": {
+      "port": 8080,
+      "host": "192.168.0.39"
+    },
+    "functions": {
+      "port": 5002,
+      "host": "192.168.0.39"
+    },
+    "ui": {
+      "enabled": true
+    }
+  }
+}

functions/.eslintrc.js

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+module.exports = {
+  root: true,
+  env: {
+    es6: true,
+    node: true,
+  },
+  extends: [
+    "eslint:recommended",
+    "google",
+  ],
+  rules: {
+    "quotes": ["error", "double"],
+    "require-jsdoc": 0,
+  },
+  parserOptions: {
+    "ecmaVersion": 8,
+  },
+};

functions/.gitignore

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+node_modules/

functions/index.js

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+const functions = require("firebase-functions");
+const fetch = require("node-fetch");
+const admin = require("firebase-admin");
+
+async function scheduledFunctionCrontab() {
+  const res = await fetch("https://notices.bulles.fr/api/v3/matching-contexts");
+  const resJSON = await res.json();
+
+  if (admin.apps.length === 0) {
+    admin.initializeApp(functions.config().firebase);
+  }
+
+  const db = admin.firestore();
+
+  const docRef = db.collection("matchingContexts");
+
+  for (const matchingContext of resJSON) {
+    docRef.doc().set(matchingContext);
+  }
+}
+
+exports.scheduledFunctionCrontab = functions
+    .pubsub // .schedule("5 11 * * *")
+    .schedule("every 30 minutes")
+    .onRun(scheduledFunctionCrontab);