Autobuild, fetch client jar from Mojang

.github/workflows/build.yml

@@ -0,0 +1,39 @@
+# Automatically build the project and run any configured tests for every push
+# and submitted pull request. This can help catch issues that only occur on
+# certain platforms or Java versions, and provides a first line of defence
+# against bad commits.
+
+name: build
+on: [pull_request, push]
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        # Use these Java versions
+        java: [
+          17,    # Current Java LTS & minimum supported by Minecraft
+        ]
+        # and run on both Linux and Windows
+        os: [ubuntu-20.04, windows-2022]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: checkout repository
+        uses: actions/checkout@v2
+      - name: validate gradle wrapper
+        uses: gradle/wrapper-validation-action@v1
+      - name: setup jdk ${{ matrix.java }}
+        uses: actions/setup-java@v1
+        with:
+          java-version: ${{ matrix.java }}
+      - name: make gradle wrapper executable
+        if: ${{ runner.os != 'Windows' }}
+        run: chmod +x ./gradlew
+      - name: build
+        run: ./gradlew build
+      - name: capture build artifacts
+        if: ${{ runner.os == 'Linux' && matrix.java == '17' }} # Only upload artifacts built from latest java on one OS
+        uses: actions/upload-artifact@v2
+        with:
+          name: Artifacts
+          path: build/libs/

build.gradle

@@ -39,13 +39,21 @@ repositories {
 		}
 		metadataSources { artifact() }
 	}
+	ivy {
+        url = "https://piston-data.mojang.com"
+        patternLayout {
+            artifact "v1/[organisation]/[revision]/[module].jar"
+            m2compatible = true
+        }
+        metadataSources { artifact() }
+    }
 }
 
 dependencies {
 	minecraft "bta-download-repo:bta:${project.bta_version}"
 	mappings loom.layered() {}
 
-	modRuntimeOnly files("libs/minecraft.jar") // only used to fix the Client run configuration
+	modRuntimeOnly "objects:client:43db9b498cb67058d2e12d394e6507722e71bb45" // https://piston-data.mojang.com/v1/objects/43db9b498cb67058d2e12d394e6507722e71bb45/client.jar
 	modImplementation "babric:fabric-loader:${project.loader_version}"
 
 	// Helper library