Fixes quickstart-build-and-test CI job in Github (#2055)

- Removes invalid .dockerignore symlink, which was
  inadvertently commited as part of #1796 (48e3e70)
- For whatever reason, docker build in ubuntu-latest
  no longer accepts a symlinked .dockerignore in the
  root context, so using a full copy instead

contrib/datawave-quickstart/docker/.dockerignore

@@ -1,4 +1,4 @@
-# This .dockerignore gets symlinked temporarily from the datawave repo's
+# This .dockerignore gets copied temporarily to the datawave repo's
 # root directory by docker-build.sh, since that directory is used as
 # the build context for the image.
 
@@ -15,9 +15,9 @@
 **/.project
 **/.settings
 
-# Ignore temporary .dockerignore symlink in the root directory...
+# Ignore temporary .dockerignore copy in the root directory...
 .dockerignore
-# ...but don't ignore the actual .dockerignore file
+# ...but don't ignore the actual .dockerignore source file
 !**/datawave-quickstart/docker/.dockerignore
 
 # Below, we mostly just ignore enviromnent-specific stuff that may have

contrib/datawave-quickstart/docker/Dockerfile

@@ -69,11 +69,9 @@ RUN /bin/bash -c "/usr/bin/nohup /usr/sbin/sshd -D &" && \
 # Primary data volume (for HDFS, Accumulo, ZooKeeper, etc)
 VOLUME ["/opt/datawave/contrib/datawave-quickstart/data"]
 
-
 # In case user wants to rebuild DW
 VOLUME ["$HOME/.m2/repository"]
 
-
 VOLUME ["/opt/datawave/contrib/datawave-quickstart/hadoop/logs"]
 VOLUME ["/opt/datawave/contrib/datawave-quickstart/accumulo/logs"]
 VOLUME ["/opt/datawave/contrib/datawave-quickstart/wildfly/standalone/log"]

contrib/datawave-quickstart/docker/docker-build.sh

@@ -100,7 +100,7 @@ function removeDatawaveTarball() {
 
 function cleanBuildContext() {
     info "Cleaning up"
-    unlink ${DATAWAVE_SOURCE_DIR}/.dockerignore > /dev/null 2>&1 && info ".dockerignore symlink removed"
+    rm -f ${DATAWAVE_SOURCE_DIR}/.dockerignore > /dev/null 2>&1 && info ".dockerignore copy removed"
 
     # Remove any potentially stale DataWave tarballs from the DW service directory. Removal
     # will guarantee that a fresh Maven build is triggered whenever env.sh is sourced
@@ -138,9 +138,9 @@ function prepareBuildContext() {
 
     datawaveBuildSucceeded || fatal "Most recent DataWave build failed. Cannot proceed with Docker build!"
 
-    # Set temporary .dockerignore symlink in DATAWAVE_SOURCE_DIR for context exclusions...
+    # Temporarily copy .dockerignore to DATAWAVE_SOURCE_DIR (i.e., root context for docker build)...
 
-    ln -s "${THIS_DIR}/.dockerignore" "${DATAWAVE_SOURCE_DIR}/.dockerignore" || fatal "Failed to set .dockerignore symlink"
+    cp "${THIS_DIR}/.dockerignore" "${DATAWAVE_SOURCE_DIR}/.dockerignore" || fatal "Failed to copy .dockerignore into place"
 
     sanityCheckTarball "${QUICKSTART_DIR}/bin/services/maven" "apache-maven*.tar.gz" "${DW_MAVEN_DIST_URI}"
 }