test: add a test to verify race free concurrent/parallel builds

Invoking parallel/concurrent builds from podman race against each other
following behviour was fixed in
containers/storage#1153 and containers/image#1480

Test verifies if following bug is fixed in new race-free API or not.
Read more about this issue, see bz 2055487 for more details.

More details here: containers/buildah#3794 and containers#13339

Co-authored-by: Ed Santiago <santiago@redhat.com>
Signed-off-by: Aditya R <arajan@redhat.com>

test/system/070-build.bats

@@ -210,6 +210,30 @@ EOF
     run_podman rmi -f build_test
 }
 
+@test "podman parallel build should not race" {
+    # Start thirty builds in parallel
+    local count=30
+    local -a pids
+    for i in $(seq --format '%02g' 1 $count); do
+        local d=$PODMAN_TMPDIR/build-test$i
+        mkdir $d
+        cat >$d/Containerfile <<EOF
+FROM $IMAGE
+RUN echo hi
+EOF
+        $PODMAN build -t i$i $d &>/dev/null &
+    done
+
+    # DANGER DANGER DANGER: this has the potential to hang forever,
+    # should any individual build fail. I can find no way to add a timeout.
+    wait
+
+    # Now delete each image. If an image wasn't built, rmi will fail
+    for i in $(seq --format '%02g' 1 $count); do
+        run_podman rmi i$i
+    done
+}
+
 @test "podman build - URLs" {
     tmpdir=$PODMAN_TMPDIR/build-test
     mkdir -p $tmpdir