Add base image for ngoduykhanh version of pdns admin

pdns-admin-base-ngoduykhanh/Dockerfile

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+FROM fedora:29
+MAINTAINER "Peter Schiffer" <peter@rfv.sk>
+
+RUN curl -sSL -o /etc/yum.repos.d/yarn.repo https://dl.yarnpkg.com/rpm/yarn.repo
+
+RUN dnf -y --setopt=install_weak_deps=False install \
+    python3-ldap \
+    python3-mysql \
+    python3-xmlsec \
+    uwsgi \
+    yarn \
+  && dnf clean all
+
+RUN mkdir -p /opt/powerdns-admin \
+  && curl -sSL https://github.com/ngoduykhanh/PowerDNS-Admin/archive/master.tar.gz \
+    | tar -xzC /opt/powerdns-admin --strip 1 \
+  && sed -i '/python-ldap/d' /opt/powerdns-admin/requirements.txt \
+  && chown -R root: /opt/powerdns-admin \
+  && chown -R uwsgi: /opt/powerdns-admin/upload
+
+WORKDIR /opt/powerdns-admin
+
+RUN pip3 install --no-cache-dir envtpl python-dotenv \
+  && pip3 install -r requirements.txt --no-cache-dir
+
+ENV PDNS_ADMIN_LOG_LEVEL="'INFO'" \
+  PDNS_ADMIN_SAML_ENABLED=False
+
+COPY config.py.tpl /
+
+RUN envtpl < /config.py.tpl > /opt/powerdns-admin/config.py \
+  && sed -i '/SQLALCHEMY_DATABASE_URI/d' /opt/powerdns-admin/config.py
+
+RUN yarn install --pure-lockfile \
+  && flask assets build \
+  && chown -R uwsgi: /opt/powerdns-admin/app/static/.webassets-cache

pdns-admin-base-ngoduykhanh/config.py.tpl

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+import os
+basedir = os.path.abspath(os.path.dirname(__file__))
+
+{% for key, value in environment('PDNS_ADMIN_') %}{{ key }} = {{ value }}
+{% endfor %}
+
+WTF_CSRF_ENABLED = True
+BIND_ADDRESS = '0.0.0.0'
+PORT = 9393
+LOG_FILE = ''
+UPLOAD_DIR = '/opt/powerdns-admin/upload'
+SQLALCHEMY_DATABASE_URI = 'mysql://' + SQLA_DB_USER + ':' + SQLA_DB_PASSWORD + '@' + SQLA_DB_HOST + ':' + SQLA_DB_PORT + '/' + SQLA_DB_NAME
+SQLALCHEMY_MIGRATE_REPO = os.path.join(basedir, 'db_repository')
+SQLALCHEMY_TRACK_MODIFICATIONS = True