Provide repro Dockerfile + script

Dockerfile

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+FROM container-registry.oracle.com/os/oraclelinux:6
+
+RUN yum -y install oracle-softwarecollection-release-el6 && \
+    yum -y install \
+        rh-python36 \
+        devtoolset-8-gcc-c++ && \
+    yum clean all && rm -rf /var/cache/yum
+
+ENV PATH=/opt/rh/rh-python36/root/usr/bin:/opt/rh/devtoolset-8/root/usr/bin:$PATH
+
+RUN python3 -m pip install pip --upgrade && \
+    python3 -m pip install conan cmake ninja
+
+RUN conan profile detect
+
+COPY repro.sh /root/repro.sh
+
+CMD ["/bin/bash", "/root/repro.sh"]
+

README.md

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+```
+$ docker build . -t conan-14945-repro
+$ docker run --rm conan-14945-repro
+```

repro.sh

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+#!/bin/bash
+
+
+echo "System information:"
+
+cat /etc/redhat-release
+g++ --version
+conan --version
+
+set -ex
+
+conan list '*:*#*'
+
+# Conan finds compatible b2 package in CCI, but that package is OS-incompatible 
+conan install --requires=boost/1.82.0 --build=missing || echo "!!! (rc=$?) Build failed as expected"
+conan list '*:*#*'
+
+# Force source build, fill local cache with our version of b2
+conan install --requires=boost/1.82.0 --build=missing --build='b2/*'
+conan list '*:*#*'
+
+# Try different build_type -- get the same error as in first run (as if our version of b2 doesn't exist)
+conan install --requires=boost/1.82.0 -s build_type=Debug --build=missing || echo "!!! (rc=$?) Build should have succeeded, but it failed"
+conan list '*:*#*'
+