Added dockerimage with all files and build pipeline

.github/workflows/build_image.yml

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+name: build and push image
+
+on:
+  push:
+    tags:
+      - "v*.*.*"
+
+jobs:
+
+  build:
+
+    runs-on: ubuntu-20.04
+
+    steps:
+
+      - uses: actions/checkout@v2
+
+      - name: Set image tag
+        run: |
+          LATEST_GIT_TAG=$(git describe --tags --abbrev=0)
+          echo "TAG=ghcr.io/internetee/epp_proxy:$LATEST_GIT_TAG" >> $GITHUB_ENV
+
+      - name: Build image
+        env:
+          KEY_BASE: ${{ secrets.KEY_BASE}}
+        run: |
+          docker build -t $TAG -f Dockerfile.generic .
+
+      - name: Push image to gh container registry
+        env:
+          PASSWORD: ${{ secrets.GHCR }}
+        run: |
+          echo $PASSWORD | docker login ghcr.io -u eisbot --password-stdin
+          docker push $TAG
+
+      - name: Notify developers
+        timeout-minutes: 1
+        env:
+          NOTIFICATION_URL: ${{ secrets.NOTIFICATION_URL}}
+        run: |
+          curl -i -X POST --data-urlencode 'payload={
+            "text": "##### Build of epp proxy image has been succesful :tada:\n
+            Run: docker pull '$TAG'
+            "
+            }' $NOTIFICATION_URL

Dockerfile.generic

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+FROM debian:buster-slim
+LABEL org.opencontainers.image.source=https://github.com/internetee/epp_proxy
+
+SHELL ["/bin/bash", "-o", "pipefail", "-c"]
+COPY ./docker/apt/sources.list /etc/apt/
+
+RUN apt-get update && apt-get install -y \
+  wget \
+  git \
+  build-essential=* \
+  libncurses5-dev=* \
+  automake=* \
+  autoconf=* \
+  curl=* \
+  ca-certificates=* \
+  libssl-dev=* \
+  libreadline-dev=* \
+  libdpkg-perl=* \
+  liberror-perl=* \
+  libc6=* \
+  libc-dev \
+  perl=* \
+  procps=* \
+  inotify-tools=* \
+  libssl1.1=* \
+  perl-base=* \
+  zlib1g-dev \
+  && apt-get clean \
+  && rm -rf /var/lib/apt/lists/*
+
+RUN git clone https://github.com/asdf-vm/asdf.git "$HOME"/.asdf && \
+    echo '. $HOME/.asdf/asdf.sh' >> "$HOME"/.bashrc && \
+        echo '. $HOME/.asdf/asdf.sh' >> "$HOME"/.profile
+
+ENV PATH="${PATH}:/root/.asdf/shims:/root/.asdf/bin"
+
+RUN mkdir -p /opt/erlang/epp_proxy
+WORKDIR /opt/erlang/epp_proxy
+
+COPY . .
+RUN asdf plugin-add erlang
+RUN asdf install
+RUN asdf global erlang $(grep erlang .tool-versions | cut -d' ' -f2)
+RUN asdf plugin-add ruby
+RUN asdf plugin-add rebar
+RUN asdf install