Fix issue with filtering deployments

Fixes issue: openfaas#736 raised by pkoelbl where all deployments in
the openfaas-fn namespace were being returned via the REST
API when listing functions.

The selector's Add method was generating a new value to be
returned instead of updating itself. A negative test would have
shown this and may be worth adding to the codebase at a
later date, or being mocked/stubbed. A PR would be welcomed
for this.

Thanks also to @LucasRoesler for helping to investigate
and confirm the fix.

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <[email protected]>

Handle null env vars

There was an error related to the following issue in
openfaas-cloud, which will also occur in faas-cli, where
null env-vars were serialized and passed into the spec.

This change has been tested and fixes the problem.

openfaas/openfaas-cloud#707

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <[email protected]>

Upgrade to Go 1.15

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <[email protected]>

Use an informer for getting replicas and functions

This should reduce rate-limiting on the Kubernetes API
server when faas-netes is making many calls. It changes
both the function list handler and the replica status
API.

The API returns much faster than before, so creates more HTTP
calls between the gateway and faas-netes, this value will
need to be tuned in the gateway to be slower between retries.

Tested with k3d and it worked as expected.

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <[email protected]>

Silence errors for namespace listing

Fixes: openfaas#724

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <[email protected]>

Add build-context to docker buildx in publish step

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <[email protected]>

Pin an earlier helm3 version

Due to CRDs moving to a v1 namespace, helm lint now fails

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <[email protected]>

Updated to build all branches and PRs

Signed-off-by: Mark Ison <[email protected]>

Additional fixes based on comments

* Run function with OPERATOR=0
* Use github-script instead of custom wait-action
* Remove push of container during CI run
* Rename tag file to publish
* Build armv7 images

Signed-off-by: Akos Veres <[email protected]>

Update chart port for forwarding

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <[email protected]>