unify 4 dockerfiles into a single Dockerfile

Dockerfile

@@ -0,0 +1,44 @@
+### image to contribute, verify, finish ceremonies
+FROM node AS zk-voceremony
+
+WORKDIR /app
+
+RUN npm config set update-notifier false && \
+    npm install -g snarkjs
+
+RUN apt update \
+    && apt install --no-install-recommends -y curl \
+    && curl -s https://packagecloud.io/install/repositories/github/git-lfs/script.deb.sh | bash \
+    && apt install --no-install-recommends -y git-lfs \
+    && git lfs install \
+    && curl -fsSL https://cli.github.com/packages/githubcli-archive-keyring.gpg | dd of=/usr/share/keyrings/githubcli-archive-keyring.gpg \
+    && chmod go+r /usr/share/keyrings/githubcli-archive-keyring.gpg \
+    && echo "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/githubcli-archive-keyring.gpg] https://cli.github.com/packages stable main" | tee /etc/apt/sources.list.d/github-cli.list > /dev/null \
+    && apt update \
+    && apt install --no-install-recommends -y gh \
+	&& apt autoremove -y \
+    && apt clean \
+    && rm -rf /var/lib/apt/lists/*
+
+ENTRYPOINT [ "bash" ]
+
+### image to create ceremonies
+FROM node AS zk-voceremony-creator
+
+WORKDIR /app
+
+RUN apt update && apt install --no-install-recommends -y -q build-essential curl
+
+RUN curl https://sh.rustup.rs -sSf | sh -s -- -y
+
+ENV PATH="/root/.cargo/bin:${PATH}"
+
+RUN mkdir -p /temp && cd /temp && \
+    git clone https://github.com/iden3/circom.git && \
+    cd circom && \
+    cargo build --release && \
+    cargo install --path circom && \
+    npm config set update-notifier false && \
+    npm install -g snarkjs circomlib
+
+ENTRYPOINT [ "bash", "./scripts/create-ceremony.sh" ]