Add Container App team to ddev trello tool

[KSerrania]

What does this PR do?

Adds Container App (label: team/container-app) to the list of teams recognized by ddev.

Motivation

Keep team list up to date.

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• PR title must be written as a CHANGELOG entry (see why)
• Files changes must correspond to the primary purpose of the PR as described in the title (small unrelated changes should have their own PR)
• PR must have changelog/ and integration/ labels attached

[codecov]

Codecov Report

Merging #6268 into master will decrease coverage by 3.30%.
The diff coverage is n/a.

Impacted Files	Coverage Δ
process/tests/common.py
redisdb/tests/test_slowlog.py
datadog_checks_base/tests/test_tracing.py
nginx_ingress_controller/tests/conftest.py
.../datadog_checks/base/checks/prometheus/__init__.py
amazon_msk/tests/test_unit.py
disk/tests/test_filter.py
coredns/datadog_checks/coredns/coredns.py
fluentd/datadog_checks/fluentd/__init__.py
coredns/datadog_checks/coredns/__about__.py
... and 766 more