With 8a2e0cb the `-b` option to select the container
binary (podman or docker) has been added. During the
adoption from the TYPO3 core implementation, it has
been discoverd that the simplified checks are not
really working and changed to the better supported
version.
Sadly, it have been missed to do the at all places
correctly.
This change covers that and modifies `runTests.sh`
to use the better supported condition form for the
container binary checks introduced with 8a2e0cb.
For example, conditions like
```shell
if [ ${CONTAINER_BIN} = "" ]; then ..
```
are changed to
```shell
if [ "${CONTAINER_BIN}" == "" ]; then ..
```
Resolves: #1085
d97d66206f