ci: wire shared opm-check workflow (opm.pipeline entry-points) (#787)

ovos-core ships three opm.pipeline plugins (converse/fallback/stop) but
had no opm_check workflow. Add the shared gh-automations opm-check caller
@dev so entry-point registration is validated on PRs.

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

Author: JarbasAl

.github/workflows/opm_check.yml

@@ -0,0 +1,17 @@
+name: OPM Plugin Check
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [dev]
+  workflow_dispatch:
+
+jobs:
+  opm_check:
+    uses: OpenVoiceOS/gh-automations/.github/workflows/opm-check.yml@dev
+    secrets: inherit
+    with:
+      system_deps: 'swig libssl-dev portaudio19-dev libpulse-dev libfann-dev'
+      install_extras: 'mycroft,plugins,skills-essential,lgpl,test'
+      python_version: '3.11'
+      plugin_type: 'pipeline'