improve curl invocations; fix timing submission

buildjob

@@ -37,15 +37,15 @@ if [[ -n "$VALIDATE" ]]; then
 fi
 
 # maybe submit timing information
-if [[ -n "$TIMING_CONF" ]]; then
+if [[ -n "$TIMING_PROJECT" && -n "$TIMING_CONF" ]]; then
     echo_color "$BOLDGREEN" "[buildjob] Submitting timing information to coq-speed"
     # check if we have the secret
     if [[ -z "$TIMING_SECRET" ]]; then
         echo_color "$BOLDRED" "[buildjob] TIMING_SECRET variable is missing"
     fi
     # Submit to webhook endpoint
-    curl --fail -X POST https://coq-speed.mpi-sws.org/webhook/build_times \
-         --user "$TIMING_SECRET"
+    curl --fail -sS -X POST https://coq-speed.mpi-sws.org/webhook/build_times \
+         --user "$TIMING_SECRET" \
          -H "X-Commit: $CI_COMMIT_SHA" \
          -H "X-Project: $TIMING_PROJECT" \
          -H "X-Branch: $CI_COMMIT_REF_NAME" \
@@ -68,7 +68,7 @@ if [[ -n "$OPAM_PKG" && "$CI_COMMIT_REF_NAME" == "$MAIN_BRANCH" ]]; then
         OPAM_PKG_PREFIX="branch.$CI_COMMIT_REF_NAME"
     fi
     # Trigger opam updater
-    curl --fail -X POST https://gitlab.mpi-sws.org/api/v4/projects/581/trigger/pipeline \
+    curl --fail -sS -X POST https://gitlab.mpi-sws.org/api/v4/projects/581/trigger/pipeline \
          -F "token=$OPAM_UPDATE_SECRET" \
          -F "ref=master" \ # the branch we trigger on the other end
          -F "variables[REPO]=$CI_PROJECT_URL.git" \