oathtool binary is not available in DSM6 or DSM7.
It needs to sideload binary and dependencies from debian or anything else to make it works...
As we have docker synology package available on most of Synology products, using a docker container is a good alternative.
This commit replace oathtool binary with docker run commandline.
the first time the command is launched, it will take some time to download missing docker image locally.
# What's expected
Since in `acme.sh` path strings are concatenated with a hardcoded slash in between, the left operand must never end with a trailing slash for the resulting path to be valid. Otherwise, obviously, the resulting path will have two adjacent slashes in the middle and will not be valid.
# What actually happens
Even though I cannot tell for each of the input params, I know this for sure for the the `--home` argument's value.
If I run `acme.sh` with `--home` argument's value being a path ending in a trailing slash,
```sh
acme.sh ... --debug ... --home /some/path/ ... -d somedomainna.me ...
```
I get the following (distinct) occurrencies of resulting invalid paths containing two adjacent slashes:
```
[...] Using config home:/some/path/
[...] DOMAIN_PATH='/some/path//somedomainna.me'
[...] _CURL='curl --silent --dump-header /some/path//http.header -L -g '
[...] The domain key is here: /some/path//somedomainna.me/somedomainna.me.key
[...] _CURL='curl --silent --dump-header /some/path//http.header -L -g -I '
[...] Your cert is in: /some/path//somedomainna.me/somedomainna.me.cer
[...] Your cert key is in: /some/path//somedomainna.me/somedomainna.me.key
[...] The intermediate CA cert is in: /some/path//somedomainna.me/ca.cer
[...] And the full chain certs is there: /some/path//somedomainna.me/fullchain.cer
```
# Suggested fix
Trim trailing slash in `--home` argument's value from the get-go.