WIP: Rerun gpg recv-keys command multiple times (#3544)

Rerun the recv-keys command 10 times if it fails

This allows us to hopefully provide some tolerance against the
timeout errors, while at the same time using the same keyserver;
fixing the problem while not modifying our risk profile.

Signed-off-by: Adam Farley <adfarley@redhat.com>

sbin/prepareWorkspace.sh

@@ -336,7 +336,18 @@ checkingAndDownloadingAlsa() {
     # Note: the uptime command below is to aid diagnostics for this issue:
     # https://github.com/adoptium/temurin-build/issues/3518#issuecomment-1792606345
     uptime
-    gpg --keyserver keyserver.ubuntu.com --keyserver-options timeout=300 --recv-keys "${ALSA_LIB_GPGKEYID}"
+    # Will retry command below until it passes or we've failed 10 times.
+    for i in {1..10}; do
+      if gpg --keyserver keyserver.ubuntu.com --keyserver-options timeout=300 --recv-keys "${ALSA_LIB_GPGKEYID}"; then
+        echo "gpg command has passed."
+        break
+      elif [[ ${i} -lt 10 ]]; then
+        echo "gpg recv-keys attempt has failed. Retrying after 10 second pause..."
+        sleep 10s
+      else
+        echo "ERROR: gpg recv-keys final attempt has failed. Will not try again."
+      fi
+    done
     echo -e "5\ny\n" |  gpg --batch --command-fd 0 --expert --edit-key "${ALSA_LIB_GPGKEYID}" trust;
     gpg --verify alsa-lib.tar.bz2.sig alsa-lib.tar.bz2 || exit 1