also fetch master

otherwise git describe --tags fails (because commits have been collapsed)

Author: blowfishpro

.github/workflows/build-and-test.yml

@@ -15,6 +15,8 @@ jobs:
         uses: actions/checkout@v2
         with:
           fetch-depth: 100
+      - name: Fetch master
+        run: git fetch --depth=100 origin master
       - name: Fetch tags
         run: git fetch --depth=1 --tags origin
       - name: Describe current revision with tags