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 <[email protected]>
Signed-off-by: Aditya R <[email protected]>

test/system/070-build.bats

@@ -210,6 +210,30 @@ EOF
     run_podman rmi -f build_test
 }
 
+@test "podman parallel build should not race" {
+    skip_if_remote "following test is not supported for remote clients"
+
+    # Run thirty parallel builds using the same Containerfile
+    cat >$PODMAN_TMPDIR/Containerfile <<EOF
+FROM $IMAGE
+RUN echo hi
+EOF
+
+    local count=30
+    for i in $(seq --format '%02g' 1 $count); do
+        timeout --foreground -v --kill=10 60 \
+                $PODMAN build -t i$i $PODMAN_TMPDIR &>/dev/null &
+    done
+
+    # Wait for all background builds to complete. Note that this succeeds
+    # even if some of the individual builds fail! Our actual test is below.
+    wait
+
+    # Now delete all built images. If any image wasn't built, rmi will fail
+    # and test will fail.
+    run_podman rmi $(seq --format 'i%02g' 1 $count)
+}
+
 @test "podman build - URLs" {
     tmpdir=$PODMAN_TMPDIR/build-test
     mkdir -p $tmpdir