Attempt to fix the build testing error.

.github/workflows/releasebuild.yml

@@ -24,6 +24,8 @@ jobs:
         uses: actions/checkout@v2
       - name: Install Go
         uses: actions/setup-go@v2
+        with:
+          go-version: '1.16'
       - uses: actions/cache@v2
         with:
           path: ~/go/pkg/mod

.github/workflows/test.yml

@@ -15,11 +15,16 @@ jobs:
 
   build:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        go: [ '1.16', '1.17', '1.18' ]
     steps:
     - uses: actions/checkout@v2
 
-    - name: Install Go
+    - name: Setup go ${{ matrix.go }}
       uses: actions/setup-go@v2
+      with:
+        go-version: ${{ matrix.go }}
 
     - uses: actions/cache@v2
       with:
@@ -28,5 +33,5 @@ jobs:
         restore-keys: |
           ${{ runner.os }}-go-
 
-    - name: Build
+    - name: Build with go ${{ matrix.go }}
       run: make all

go.mod

@@ -1,6 +1,6 @@
 module github.com/hpcng/warewulf
 
-go 1.15
+go 1.16
 
 require (
 	github.com/brotherpowers/ipsubnet v0.0.0-20170914094241-30bc98f0a5b1