Replace Drone CI configuration with GitHub Actions workflow and update README badge

.drone.yml

@@ -1,51 +0,0 @@
-kind: pipeline
-type: docker
-name: build
-
-steps:
-  - name: install
-    image: node:lts-alpine
-    commands:
-      - npm install
-
-  - name: lint
-    image: node:lts-alpine
-    commands:
-      - npm run lint
-    depends_on:
-      - install
-
-  - name: test
-    image: node:lts-alpine
-    commands:
-      - npm run test
-    depends_on:
-      - install
-
-  - name: build
-    image: node:lts-alpine
-    commands:
-      - apk add zip
-      - npm run build
-      - zip -r romulus-m.zip dist/
-    depends_on:
-      - install
-
-  - name: publish
-    image: plugins/gitea-release
-    depends_on:
-      - lint
-      - test
-      - build
-    when:
-      event:
-        - tag
-    settings:
-      base_url: https://git.jacknet.io
-      api_key:
-        from_secret: gitea_token
-      files:
-        - romulus-m.zip
-      checksum:
-        - md5
-        - sha256

.gitea/workflows/ci.yml

@@ -0,0 +1,33 @@
+name: CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 'lts/*'
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm install
+
+      - name: Run linter
+        run: npm run lint
+
+      - name: Run tests
+        run: npm run test
+
+      - name: Build project
+        run: npm run build

README.md

@@ -1,6 +1,6 @@
 # Romulus-JS
 
-[![Build Status](https://drone.jacknet.io/api/badges/TerribleCodeClub/romulus-js/status.svg)](https://drone.jacknet.io/TerribleCodeClub/romulus-js) [![code style: prettier](https://img.shields.io/badge/code_style-prettier-ff69b4.svg?style=flat-square)](https://github.com/prettier/prettier)
+[![CI](https://git.jacknet.io/TerribleCodeClub/romulus-js/actions/workflows/ci.yml/badge.svg)](https://git.jacknet.io/TerribleCodeClub/romulus-js/actions) [![code style: prettier](https://img.shields.io/badge/code_style-prettier-ff69b4.svg?style=flat-square)](https://github.com/prettier/prettier)
 
 An implementation of the Romulus-M cryptography specification.