Add Alpine image with MDCLog library @ ver 0.0.4

Signed-off-by: Lott, Christopher (cl778h) <cl778h@att.com>
Change-Id: I139c03b70ca9809cc1e77dae9701dfdb7d03c06a

diff --git a/bldr-imgs/bldr-alpine3-mdclog/Dockerfile b/bldr-imgs/bldr-alpine3-mdclog/Dockerfile
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+++ b/bldr-imgs/bldr-alpine3-mdclog/Dockerfile
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+# O-RAN-SC
+#
+# Copyright (C) 2019-2020 AT&T Intellectual Property and Nokia
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Provides MDCLOG for Alpine including header files and shared-object libraries,
+# basically a workaround for missing APK support at PackageCloud.io.
+# Unlike other bldr- images, this only has library files, no build tools.
+# See list of available files below.  Use the following command to copy a file
+# in a Docker build, after replacing "TAG" with the desired version string:
+#
+# COPY --from=nexus3.o-ran-sc.org:10002/bldr-alpine3-mdclog:TAG /usr/local/lib/libmdclog.so /usr/local/lib/libmdclog.so
+#
+# /usr/local/include/mdclog:
+#     mdclog.h
+#
+# /usr/local/lib:
+#     libmdclog.a
+#     libmdclog.la
+#     libmdclog.so
+#     libmdclog.so.0         (subject to version change)
+#     libmdclog.so.0.0.4     (ditto)
+
+FROM alpine:3.11 as bldr
+RUN apk update && apk add autoconf automake build-base cmake libtool pkgconfig git sudo
+
+# the autoconf-archive in alpine's edge repos is too new
+# for our purposes, so we'll use one from the source.
+RUN cd /tmp \
+    && git clone --branch v2015.09.25 git://git.sv.gnu.org/autoconf-archive.git \
+    && cp /tmp/autoconf-archive/m4/* /usr/share/aclocal \
+    && rm -rf /tmp/autoconf-archive
+
+# MCDLOG, version is pinned
+RUN cd /tmp \
+   && git clone --branch v0.0.4 https://gerrit.o-ran-sc.org/r/com/log \
+   && cd log \
+   && ./autogen.sh \
+   && ./configure \
+   && make \
+   && make install
+
+FROM scratch
+COPY --from=bldr /usr/local/include/mdclog /usr/local/include/mdclog
+COPY --from=bldr /usr/local/lib/libmdclog.* /usr/local/lib/

diff --git a/bldr-imgs/bldr-alpine3-mdclog/container-tag.yaml b/bldr-imgs/bldr-alpine3-mdclog/container-tag.yaml
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+# Version of the com/log aka MDCLog library
+---
+tag: 0.0.4