Allow Docker environment to ignore unknown headers

Dockerfile

@@ -13,6 +13,7 @@ ENV \
     S3PROXY_IDENTITY="local-identity" \
     S3PROXY_CREDENTIAL="local-credential" \
     S3PROXY_CORS_ALLOW_ALL="false" \
+    S3PROXY_IGNORE_UNKNOWN_HEADERS="false" \
     JCLOUDS_PROVIDER="filesystem" \
     JCLOUDS_ENDPOINT="" \
     JCLOUDS_REGION="" \

src/main/java/org/gaul/s3proxy/Main.java

@@ -214,7 +214,7 @@ public final class Main {
                 s3ProxyBuilder.v4MaxNonChunkedRequestSize(Long.parseLong(
                         v4MaxNonChunkedRequestSize));
             }
-            if (ignoreUnknownHeaders != null) {
+            if (!Strings.isNullOrEmpty(ignoreUnknownHeaders)) {
                 s3ProxyBuilder.ignoreUnknownHeaders(Boolean.parseBoolean(
                         ignoreUnknownHeaders));
             }

src/main/resources/run-docker-container.sh

@@ -8,6 +8,7 @@ exec java \
     -Ds3proxy.identity=${S3PROXY_IDENTITY} \
     -Ds3proxy.credential=${S3PROXY_CREDENTIAL} \
     -Ds3proxy.cors-allow-all=${S3PROXY_CORS_ALLOW_ALL} \
+    -Ds3proxy.ignore-unknown-headers=${S3PROXY_IGNORE_UNKNOWN_HEADERS} \
     -Djclouds.provider=${JCLOUDS_PROVIDER} \
     -Djclouds.identity=${JCLOUDS_IDENTITY} \
     -Djclouds.credential=${JCLOUDS_CREDENTIAL} \