Build UMF on Alpine image

Author: wlemkows

.github/docker/ubuntu-20.04.Dockerfile

@@ -61,3 +61,4 @@ RUN pip3 install --no-cache-dir -r /opt/umf/requirements.txt
 ENV USER test_user
 ENV USERPASS pass
 RUN useradd -m "${USER}" -g sudo -p "$(mkpasswd ${USERPASS})"
+USER test_user

.github/workflows/nightly.yml

@@ -13,8 +13,6 @@ permissions:
 env:
   BUILD_DIR : "${{github.workspace}}/build"
   INSTALL_DIR: "${{github.workspace}}/build/install"
-  HOST_WORKDIR: ${{github.workspace}}
-  WORKDIR: /unified-memory-framework
 
 jobs:
   fuzz-test:
@@ -375,8 +373,10 @@ jobs:
 
   alpine:
     name: Alpine
+    env:
+      HOST_WORKDIR: ${{github.workspace}}
+      WORKDIR: /unified-memory-framework
     strategy:
-      fail-fast: false
       matrix:
           build_type: [Debug, Release]
     runs-on: ubuntu-latest