Add cloudwatch and s3 plugins

Dockerfile

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+FROM fluent/fluentd-kubernetes-daemonset:v1-debian-elasticsearch7
+
+USER root
+
+COPY Gemfile* /fluentd/
+
+RUN buildDeps="sudo make gcc g++ libc-dev libffi-dev" \
+  runtimeDeps="" \
+      && apt-get update \
+     && apt-get upgrade -y \
+     && apt-get install \
+     -y --no-install-recommends \
+     $buildDeps $runtimeDeps \
+    && gem install bundler --version 2.1.4 \
+    && bundle config silence_root_warning true \
+    && bundle install --gemfile=/fluentd/Gemfile --path=/fluentd/vendor/bundle \
+    && SUDO_FORCE_REMOVE=yes \
+    apt-get purge -y --auto-remove \
+                  -o APT::AutoRemove::RecommendsImportant=false \
+                  $buildDeps \
+ && rm -rf /var/lib/apt/lists/* \
+    && gem sources --clear-all \
+    && rm -rf /tmp/* /var/tmp/* /usr/lib/ruby/gems/*/cache/*.gem

Gemfile

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+source "https://rubygems.org"
+
+gem "aws-sdk-cloudwatchlogs", "~> 1.0"
+gem "fluent-plugin-cloudwatch-logs", "~> 0.10.0"
+gem "aws-sdk-s3", "~> 1.75"
+gem "fluent-plugin-s3", "~> 1.3.0"