Added multi architecture docker build.

.github/workflows/main.yml

@@ -21,22 +21,20 @@ jobs:
         uses: actions/checkout@v3
       - name: Docker info
         run: docker info
-      - name: Build docker image
+      - name: Build sdr-scanner
         run: |
           echo "constexpr auto GIT_COMMIT = \"$(git rev-parse HEAD)\";" > sources/version.h
           echo "constexpr auto GIT_TAG = \"$(git describe --tags)\";" >> sources/version.h
-          docker build -t sdr-scanner-test -f Dockerfile . --target test
-          docker build -t sdr-scanner -f Dockerfile .
+          docker build -t sdr-scanner-test --target test .
+          docker build -t sdr-scanner .
       - name: Test sdr-scanner
         run: docker run --rm sdr-scanner-test
       - name: Run sdr-scanner
         run: docker run --rm sdr-scanner
-      - name: Deploy sdr-scanner tag
+      - name: Deploy sdr-scanner
         if: github.ref_type == 'tag'
         run: |
           TAG=${GITHUB_REF_NAME/v/}
           docker login -u ${{ secrets.DOCKER_HUB_USERNAME }} -p ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }} docker.io
-          docker image tag sdr-scanner docker.io/shajen/sdr-scanner:$TAG
-          docker image tag sdr-scanner docker.io/shajen/sdr-scanner
-          docker push docker.io/shajen/sdr-scanner:$TAG
-          docker push docker.io/shajen/sdr-scanner
+          docker buildx create --use || true
+          docker buildx build --platform linux/arm/v7,linux/arm64/v8,linux/amd64 -t docker.io/shajen/sdr-scanner:$TAG -t docker.io/shajen/sdr-scanner --push .

README.md

@@ -67,6 +67,14 @@ blacklist rtl2832_sdr
 blacklist rtl8xxxu
 ```
 
+## RaspberryPi
+
+Docker version should work on `RaspberryPi`, but keep in mind that `RaspberryPi` is **not powefull machine** and is **not good** for sdr data processing. `sdr` device can produce **40 megabytes per second**! It's a lot of data for `RaspberryPi` to processing in real time. It's a lot of data even for some desktop computers.
+
+If you still want to do this, please replace the `SD` card with a fast one and make sure you have a strong version of `RaspberryPi`.
+
+Better idea is to build `sdr-scanner` from sources via `cmake` and run natively on `RaspberryPi`. Next run `sdr-monitor` and `mqtt-broker` on any other machine (even in the cloud) and connect `sdr-scanner` to them (you have to set valid mqtt data in `config.json` and maybe manipulate in `docker-compose.yml`).
+
 ## Noise learner
 
 To auto-detect transmissions, sdr scanner has to learn noise level every run. It takes first `n` seconds (defined in `config.json` as `noise_learning_time_seconds` default is `30` seconds). So if any transmission will appear in this period it's may not be detected by scanner later.