ci: add missing Go setup

Signed-off-by: Paul Meyer <49727155+katexochen@users.noreply.github.com>

.github/workflows/build-os-image.yml

@@ -61,6 +61,12 @@ jobs:
         with:
           ref: ${{ inputs.ref || github.head_ref }}
 
+      - name: Setup Go environment
+        uses: actions/setup-go@6edd4406fa81c3da01a34fa6f6343087c207a568 # v3.5.0
+        with:
+          go-version: "1.20.1"
+          cache: true
+
       - name: Build bootstrapper
         if: inputs.stream != 'debug'
         uses: ./.github/actions/build_bootstrapper

go.work

@@ -1,4 +1,4 @@
-go 1.19
+go 1.20
 
 use (
 	.