}

    @Provides
    static Session newSession(RepositorySystem system, Lookup lookup) {
        Map<String, String> properties = new HashMap<>();
        // Env variables prefixed with "env."
        System.getenv().forEach((k, v) -> properties.put("env." + k, v));
        // Java System properties
        System.getProperties().forEach((k, v) -> properties.put(k.toString(), v.toString()));

        valueSources.add(new AbstractValueSource(false) {
            @Override
            public Object getValue(String expression) {
                return request.getSystemProperties().get("env." + expression);
            }
        });

        valueSources.add(prefixlessObjectBasedValueSource);

        return valueSources;
    }

        valueSources.add(new AbstractValueSource(false) {

            public Object getValue(String expression) {
                return config.getExecutionProperties().getProperty("env." + expression);
            }
        });
        valueSources.add(modelValueSource2);

        return valueSources;
    }

    protected List<InterpolationPostProcessor> createPostProcessors(

     * Returns immutable system properties to use for interpolation. The system properties are collected from the
     * runtime environment such as {@link System#getProperties()} and environment variables
     * (prefixed with {@code env.}).
     *
     * @return the system properties, never {@code null}
     */
    @Nonnull
    Map<String, String> getSystemProperties();

    /**

     | or the command line, profiles have to have an ID that is unique.
     |
     | An encouraged best practice for profile identification is to use a consistent naming convention
     | for profiles, such as 'env-dev', 'env-test', 'env-production', 'user-jdcasey', 'user-brett', etc.
     | This will make it more intuitive to understand what the set of introduced profiles is attempting

        sessionBuilder.setArtifactTypeRegistry(new TypeRegistryAdapter(typeRegistry)); // dynamic
        sessionBuilder.setCache(request.getRepositoryCache());

        // this map is read ONLY to get config from (profiles + env + system + user)
        Map<String, String> mergedProps = createMergedProperties(request);

        // configProps map is kept "pristine", is written ONLY, the mandatory resolver config