Fix build-images-releases.yml

I messed up the indentation, and accidentally removed an if condition.

Fixes: 19e4a5a ("Use 'go install' to install bom")

Signed-off-by: Michi Mutsuzaki <michi@isovalent.com>

.github/workflows/build-images-releases.yml

@@ -87,12 +87,13 @@ jobs:
           cosign sign quay.io/${{ github.repository_owner }}/${{ matrix.name }}@${{ steps.docker_build_release.outputs.digest }}
           cosign sign quay.io/${{ github.repository_owner }}/${{ matrix.name }}-ci@${{ steps.docker_build_release.outputs.digest }}
 
-     - name: Install Go
-        uses: actions/setup-go@93397bea11091df50f3d7e59dc26a7711a8bcfbe # v4.1.0
-        with:
-          go-version-file: 'go.mod'
+      - name: Install Go
+         uses: actions/setup-go@93397bea11091df50f3d7e59dc26a7711a8bcfbe # v4.1.0
+         with:
+           go-version-file: 'go.mod'
 
       - name: Install Bom
+        if: ${{ startsWith(steps.tag.outputs.tag, 'v') }}
         shell: bash
         env:
           # renovate: datasource=github-releases depName=kubernetes-sigs/bom