workflow: remove version tag update workflow
The logic here was broken: it'll try to use whatever tag corresponds
to the latest OPA version. However, the tagged images only get created
int the post-tag workflow.
Since we've got a PR check step that verifies that whatever image tag
is used in the examples/istio/quick_start.yaml, we cannot update those
references without having pushed a tag first.
* README,quickstarts: remove tagged images, use latest-{envoy,istio}
With this, we also don't need the update script.
* Revert "workflow/checks: run istio example with tagged image (#264)"
This reverts commit 8db9ac9b51e5cd631a17be61ec32a2f4f04b1f9d.
Signed-off-by: Stephan Renatus <[email protected]>
