🐒 Add docker instructions

01-prepare-docker.md

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+# Preparing Docker environment
+
+We create a `Dockerfile`:
+
+```Dockerfile
+FROM ubuntu:22.04
+
+RUN apt-get -y update
+RUN apt-get -y install default-jre default-jdk python3-dev build-essential clang wget libpq-dev zip git
+
+RUN wget https://github.com/bazelbuild/bazelisk/releases/download/v1.18.0/bazelisk-linux-amd64 -O /usr/bin/bazel
+RUN chmod +x /usr/bin/bazel
+
+RUN git clone "https://gerrit.hackerspace.pl/hscloud"
+WORKDIR /hscloud
+
+RUN groupadd appgroup && useradd -m -s /bin/bash -g appgroup appuser
+
+RUN chown -R appuser:appgroup /hscloud
+USER appuser
+
+RUN bazel build //tools:install
+RUN bazel run //tools:install
+
+ENV PATH="$PATH:/hscloud/bazel-bin/tools:/hscloud/bazel-bin/cluster/tools"
+```
+
+Now we run 
+
+```bash
+docker build -t hscloud:latest .
+```
+
+after build we can access terminal by:
+
+```bash
+docker run hscloud:latest -it
+```