Fetch all commits to allow version to be computed correctly

Author: anuraaga

.github/workflows/main-build.yml

@@ -8,6 +8,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
       - uses: actions/setup-java@v1
         with:
           java-version: 14