Fix make test on arm64 runners

The environment variables set at the Makefile were causing go install to
yield a corrupted file for setup-envtest. To fix the issue, such operation
is now always executed in a clean bash.

Signed-off-by: Paulo Gomes <paulo.gomes@weave.works>

.github/workflows/e2e.yaml

@@ -57,11 +57,7 @@ jobs:
         with:
           go-version: 1.17.x
       - name: Run tests
-        run: |
-          mkdir tmp-download; cd tmp-download; go mod init go-download;
-          GOBIN="${GITHUB_WORKSPACE}/build/gobin" go install sigs.k8s.io/controller-runtime/tools/setup-envtest@latest
-          cd ..; rm -rf tmp-download
-          make test
+        run: make test
       - name: Prepare
         id: prep
         run: |

Makefile

@@ -224,7 +224,7 @@ TMP_DIR=$$(mktemp -d) ;\
 cd $$TMP_DIR ;\
 go mod init tmp ;\
 echo "Downloading $(2)" ;\
-go install $(2) ;\
+env -i bash -c "GOBIN=$(GOBIN) PATH=$(PATH) GOPATH=$(shell go env GOPATH) GOCACHE=$(shell go env GOCACHE) go install $(2)" ;\
 rm -rf $$TMP_DIR ;\
 }
 endef