Publish gen2_develop Docker image

Resolves luxonis/depthai#295

Build libusb without udev support in the container since udev is
typically not run inside containers

.github/workflows/docker-hub-g2-devel.yml

@@ -0,0 +1,25 @@
+name: Publish Docker image
+on:
+  push:
+    branches:
+      - gen2_develop
+jobs:
+  push_to_registry:
+    name: Push Docker image to Docker Hub
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      - name: Login to DockerHub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKERHUB_USER }}
+          password: ${{ secrets.DOCKERHUB_PASS }}
+      - name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          push: true
+          file: ci/Dockerfile
+          tags: luxonis/depthai-library:latest

.github/workflows/docker-hub.yml

@@ -0,0 +1,24 @@
+name: Publish Docker image
+on:
+  push:
+    tags:
+jobs:
+  push_to_registry:
+    name: Push Docker image to Docker Hub
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      - name: Login to DockerHub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKERHUB_USER }}
+          password: ${{ secrets.DOCKERHUB_PASS }}
+      - name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          push: true
+          file: ci/Dockerfile
+          tags: luxonis/depthai-library:${{ env.GITHUB_REF }}

ci/Dockerfile

@@ -0,0 +1,23 @@
+FROM luxonis/depthai-base:latest
+
+RUN apt install wget
+RUN wget https://github.com/libusb/libusb/releases/download/v1.0.24/libusb-1.0.24.tar.bz2
+RUN tar xf libusb-1.0.24.tar.bz2
+RUN cd libusb-1.0.24 && \
+    ./configure --disable-udev && \
+    make -j && make install
+
+RUN pip install opencv-python
+
+COPY . /depthai-python
+RUN mkdir -p depthai-python/build
+RUN cd /depthai-python && \
+    git submodule update --init --recursive && \
+    cd build && \
+    cmake .. && \
+    make -j
+ENV PYTHONPATH=/depthai-python/build
+
+RUN mkdir -p /depthai-python/examples/models/
+RUN cd /depthai-python/examples/models/ && \
+    wget https://artifacts.luxonis.com/artifactory/luxonis-depthai-data-local/network/mobilenet.blob