Add workflow to build jar and store as artifact

.forgejo/workflows/build-jar.yaml

@@ -0,0 +1,18 @@
+name: Build TurnBasedMC and store Artifact
+on:
+  push:
+    branches:
+      - 'master'
+
+jobs:
+  build-and-store-artifact:
+    runs-on: archLinux
+    steps:
+      - run: git clone --depth=1 --no-single-branch https://git.seodisparate.com/stephenseo/TurnBasedMinecraftMod.git TBMM
+      - run: cd TBMM && git checkout master
+      - run: cd TBMM && ./gradlew build
+      - run: cd TBMM/build/libs && java --version >> javaVersion.txt && javac --version >> javaVersion.txt && find . -type f -exec bash -c 'sha256sum {} >> sha256sums.txt'
+      - uses: actions/upload-artifact@v3
+        with:
+          name: built-jars-and-metadata
+          path: TBMM/build/libs/