Install Go during publish CI step

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <[email protected]>

Author: alexellis

.github/workflows/publish.yaml

@@ -16,8 +16,13 @@ jobs:
       - uses: actions/checkout@master
         with:
           fetch-depth: 1
+      - name: Install Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: ${{ matrix.go-version }}
       - name: Make
         run: make all
+
       - name: Upload release binaries
         uses: alexellis/[email protected]
         env: