Remove release directory (#2517)

Remove release directory
diff --git a/release/DOCKERFILE b/release/DOCKERFILE
deleted file mode 100644
index 07a25f0..0000000
--- a/release/DOCKERFILE
+++ /dev/null
@@ -1,13 +0,0 @@
-FROM ubuntu:bionic@sha256:c1d0baf2425ecef88a2f0c3543ec43690dc16cc80d3c4e593bb95e4f45390e45
-RUN apt update
-RUN apt install -y git
-RUN git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
-ENV PATH="${PATH}:/depot_tools"
-RUN apt update
-RUN apt upgrade -y
-RUN apt install curl -y
-RUN curl -fsSL https://cli.github.com/packages/githubcli-archive-keyring.gpg | dd of=/usr/share/keyrings/githubcli-archive-keyring.gpg \
-  && chmod go+r /usr/share/keyrings/githubcli-archive-keyring.gpg \
-  && echo "deb [arch=$(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 gh -yi
diff --git a/release/README.md b/release/README.md
deleted file mode 100644
index 4015e71..0000000
--- a/release/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# Flutter Release Docker Image
-
-The release folder contains the Dockerfile which is used to create the docker image used by Louhi workflows for 3P releases.