envoy: add bazel remote caching
envoy: add bazel remote caching

In order to build bazel in CI without getting cache misses, the flag
experimental_strict_action_env was added as a bazel flag.

Signed-off-by: André Martins <bc9800b9d52a24cce72a73dd528afed53f10e5fc@cilium.io>

michi-covalent/cilium,michi-covalent/cilium,tklauser/cilium,cilium/cilium,scanf/cilium,eloycoto/cilium,tgraf/cilium,eloycoto/cilium,cilium/cilium,scanf/cilium,tklauser/cilium,cilium-team/cilium,eloycoto/cilium,cilium/cilium,eloycoto/cilium,cilium/cilium,tgraf/cilium,tklauser/cilium,scanf/cilium,tklauser/cilium,cilium/cilium,scanf/cilium,michi-covalent/cilium,scanf/cilium,cilium-team/cilium,tgraf/cilium,michi-covalent/cilium,eloycoto/cilium,tgraf/cilium,scanf/cilium,scanf/cilium,michi-covalent/cilium,tgraf/cilium,eloycoto/cilium,tgraf/cilium,tklauser/cilium,eloycoto/cilium