add Dockerfiles for fedora

elixir/1.10.4/fedora/Dockerfile

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+FROM avvo/erlang:23.0.4-fedora-32
+
+# Adapted from:
+#   https://github.com/c0b/docker-elixir/blob/master/1.10/alpine/Dockerfile
+
+# elixir expects utf8.
+ENV ELIXIR_VERSION="v1.10.4" \
+  LANG=C.UTF-8
+
+RUN set -xe \
+  && ELIXIR_DOWNLOAD_URL="https://github.com/elixir-lang/elixir/archive/${ELIXIR_VERSION}.tar.gz" \
+  && ELIXIR_DOWNLOAD_SHA256="8518c78f43fe36315dbe0d623823c2c1b7a025c114f3f4adbb48e04ef63f1d9f" \
+  && deps=' \
+    ca-certificates \
+    make \
+    automake \
+    gcc \
+    gcc-c++ \
+    kernel-devel \
+    openssh-clients \
+    npm \
+    git \
+  ' \
+  && dnf -y update \
+  && dnf -y install $deps \
+  && curl -fSL -o elixir-src.tar.gz $ELIXIR_DOWNLOAD_URL \
+  && echo "$ELIXIR_DOWNLOAD_SHA256  elixir-src.tar.gz" | sha256sum -c - \
+  && mkdir -p /usr/local/src/elixir \
+  && tar -xzC /usr/local/src/elixir --strip-components=1 -f elixir-src.tar.gz \
+  && rm elixir-src.tar.gz \
+  && cd /usr/local/src/elixir \
+  && make install clean \
+  && dnf -y autoremove \
+  && dnf -y clean all \
+  && rm -rf /var/cache/yum \
+  && mix local.hex --force \
+  && mix local.rebar --force \
+  && mkdir -p '/root/.ssh' \
+  && ssh-keyscan -t rsa github.com > '/root/.ssh/known_hosts' \
+  && chmod 700 '/root/.ssh' \
+  && chmod 600 '/root/.ssh/known_hosts'

erlang/23.0.4/fedora/Dockerfile

@@ -0,0 +1,66 @@
+FROM avvo/fedora:32
+
+# Adapted from: https://github.com/erlang/docker-erlang-otp/blob/master/23/alpine/Dockerfile
+
+ENV OTP_VERSION="23.0.4" \
+    REBAR3_VERSION="3.14.1"
+
+
+RUN set -xe \
+  && OTP_DOWNLOAD_URL="https://github.com/erlang/otp/archive/OTP-${OTP_VERSION}.tar.gz" \
+	&& OTP_DOWNLOAD_SHA256="29e92db80229ec7903f93e5b152c7ca721cc44b58519199ea60b8e0d583faf93" \
+  && REBAR3_DOWNLOAD_URL="https://github.com/erlang/rebar3/archive/${REBAR3_VERSION}.tar.gz" \
+	&& REBAR3_DOWNLOAD_SHA256="b01275b6cbdb354dcf9ed686fce2b5f9dfdd58972ded9e970e31b9215a8521f2" \
+  && curl -fSL -o otp-src.tar.gz "$OTP_DOWNLOAD_URL" \
+  && echo "$OTP_DOWNLOAD_SHA256  otp-src.tar.gz" | sha256sum -c - \
+  && buildDeps='\
+    gcc \
+    g++ \
+    make \
+    autoconf \
+    ncurses-devel \
+    unixODBC-devel \
+    openssl-devel \
+    findutils \
+    pax-utils \
+  ' \
+  && dnf -y update \
+  && dnf -y install $buildDeps \
+  && export ERL_TOP="/usr/src/otp_src_${OTP_VERSION%%@*}" \
+  && mkdir -vp $ERL_TOP \
+  && tar -xzf otp-src.tar.gz -C $ERL_TOP --strip-components=1 \
+  && rm otp-src.tar.gz \
+  && ( cd $ERL_TOP \
+	  && ./otp_build autoconf \
+	  && ./configure \
+	  && make -j$(getconf _NPROCESSORS_ONLN) \
+ 	  && make install ) \
+  && rm -rf $ERL_TOP \
+  && find /usr/local -regex '/usr/local/lib/erlang/\(lib/\|erts-\).*/\(man\|doc\|obj\|c_src\|emacs\|info\|examples\)' | xargs rm -rf \
+	&& find /usr/local -name src | xargs -r find | grep -v '\.hrl$' | xargs rm -v || true \
+	&& find /usr/local -name src | xargs -r find | xargs rmdir -vp || true \
+	&& scanelf --nobanner -E ET_EXEC -BF '%F' --recursive /usr/local | xargs -r strip --strip-all \
+	&& scanelf --nobanner -E ET_DYN -BF '%F' --recursive /usr/local | xargs -r strip --strip-unneeded \
+	&& runDeps="$( \
+		scanelf --needed --nobanner --format '%n#p' --recursive /usr/local \
+			| tr ',' '\n' \
+			| sort -u \
+			| awk 'system("[ -e /usr/local/lib/" $1 " ]") == 0 { next } { print $1 }' \
+	)" \
+	&& curl -fSL -o rebar3-src.tar.gz "$REBAR3_DOWNLOAD_URL" \
+	&& echo "${REBAR3_DOWNLOAD_SHA256}  rebar3-src.tar.gz" | sha256sum -c - \
+	&& mkdir -p /usr/src/rebar3-src \
+	&& tar -xzf rebar3-src.tar.gz -C /usr/src/rebar3-src --strip-components=1 \
+	&& rm rebar3-src.tar.gz \
+	&& cd /usr/src/rebar3-src \
+	&& HOME=$PWD ./bootstrap \
+	&& install -v ./rebar3 /usr/local/bin/ \
+	&& rm -rf /usr/src/rebar3-src \
+	&& dnf -y install \
+		$runDeps \
+		lksctp-tools \
+		ca-certificates \
+  && dnf -y remove $buildDeps \
+  && dnf -y autoremove \
+	&& dnf -y clean all \
+  && rm -rf /var/cache/yum