🔇 Set sh.command log level to warning

sh INFO log level is too verbose by default, refs upstream TODO

TODO:
I was tracking a sh logger issue being too verbose.
It turns out that this is an old upstream issue that we see because we run the CI
using an old p4a Docker image (3 years old) from DockerHub

TODO:
explain the token was generated via https://app.docker.com/settings/personal-access-tokens
set under https://github.com/kivy/python-for-android/settings/secrets/actions
Explain it's currently under `andremiras` account, but can be changed any time.
Explain we made it a dedicated workflow to not add more complexity to the push one,
but that also mean we rebuild the image.
Explain that later we could add support for multi architecture.
- update the icon

.github/workflows/docker.yml

@@ -0,0 +1,26 @@
+name: Docker
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - develop
+      # TODO
+      - feature/dockerhub_push
+  pull_request:
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: docker/setup-buildx-action@v3
+      - run: make docker/build
+      - run: make docker/login
+        env:
+          DOCKERHUB_USERNAME: ${{ secrets.DOCKERHUB_USERNAME }}
+          DOCKERHUB_TOKEN: ${{ secrets.DOCKERHUB_TOKEN }}
+      - name: docker push
+        # TODO
+        # if: github.ref == 'develop'
+        run: make docker/push