.github: extract standalone testbench.yml from Main Actions

Divide and Conquer.

Signed-off-by: Marc Herbert <marc.herbert@intel.com>

.github/workflows/pull-request.yml

@@ -29,10 +29,6 @@ on:
   # Allows you to run this workflow manually from the Actions tab
   workflow_dispatch:
 
-# Some jobs may not need submodules but for now our CMakeLists.txt
-# systemically downloads them anyway when missing at build time. Easier
-# and cleaner to clone everything at once.
-
 jobs:
 
   doxygen:
@@ -99,31 +95,6 @@ jobs:
         run: make -C sof-docs/ html SOF_DOC_BUILD="$(pwd)"/doxybuild/
 
 
-  testbench:
-    runs-on: ubuntu-22.04
-
-    steps:
-      - uses: actions/checkout@v2
-        with: {fetch-depth: 5}
-
-      - name: apt get
-        run: sudo apt-get update &&
-             sudo apt-get -y install valgrind alsa-utils libasound2-dev ninja-build
-             octave octave-io octave-signal
-
-      # testbench needs some topologies.
-      - name: build test topologies
-        run: ./scripts/build-tools.sh -t ||
-             VERBOSE=1 NO_PROCESSORS=1 USE_XARGS=no
-             ./scripts/build-tools.sh -t
-
-      - name: build testbench
-        run: ./scripts/rebuild-testbench.sh
-
-      - name: run testbench
-        run: ./scripts/host-testbench.sh
-
-
   # This is a bit redundant with the other jobs below and with the (much
   # faster!) installer[.yml] but it may differ in which platforms are
   # built.  This makes sure platforms without any open-source toolchain

.github/workflows/testbench.yml

@@ -0,0 +1,54 @@
+---
+# Tools that can save round-trips to github and a lot of time:
+#
+# yamllint -f parsable pull_request.yml
+# pip3 install ruamel.yaml.cmd
+# yaml merge-expand pull_request.yml exp.yml &&
+#    diff -w -u pull_request.yml exp.yml
+#
+# github.com also has a powerful web editor that can be used without
+# committing.
+
+name: testbench
+
+# yamllint disable-line rule:truthy
+on:
+  push:
+    branches:
+      - 'main'
+      - 'stable-**'
+      - '**-stable'
+  pull_request:
+    branches:
+      - 'main'
+      - 'stable-**'
+      - '**-stable'
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+jobs:
+
+  build-run:
+    runs-on: ubuntu-22.04
+
+    steps:
+      - uses: actions/checkout@v2
+        with: {fetch-depth: 5}
+
+      - name: apt get
+        run: sudo apt-get update &&
+             sudo apt-get -y install valgrind alsa-utils libasound2-dev ninja-build
+             octave octave-io octave-signal
+
+      # testbench needs some topologies.
+      - name: build test topologies
+        run: ./scripts/build-tools.sh -t ||
+             VERBOSE=1 NO_PROCESSORS=1 USE_XARGS=no
+             ./scripts/build-tools.sh -t
+
+      - name: build testbench
+        run: ./scripts/rebuild-testbench.sh
+
+      - name: run testbench
+        run: ./scripts/host-testbench.sh