Use isTrue function for MW_ENABLE_JOB_RUNNER and MW_ENABLE_TRANSCODER vars

[pastakhov]

No description provided.

[github-actions]

Image is built and pushed to the repository as ghcr.io/canastawiki/canasta:1.35.6-20220529-96

[pastakhov]

I tested it locally, jobrunner and transcoder are enabled, Sitemap generator is disabled
output of web docker container:

...
web_1            | Starting services..
web_1            | + jobrunner
web_1            | + transcoder
web_1            | + sleep 3
web_1            | + sleep 3
web_1            | + sitemapgen
web_1            | + rm -rf '/run/httpd/*' '/tmp/httpd*'
web_1            | + sleep 3
web_1            | + exec /usr/sbin/apachectl -DFOREGROUND
web_1            | AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 172.27.0.4. Set the 'ServerName' directive globally to suppress this message
web_1            | + isTrue true
web_1            | + isTrue true
web_1            | + case $1 in
web_1            | + case $1 in
web_1            | + return 0
web_1            | + return 0
web_1            | + isTrue false
web_1            | + echo Run transcoder
web_1            | + case $1 in
web_1            | + echo Run Jobs
web_1            | + return 1
web_1            | Run transcoder
web_1            | Run Jobs
web_1            | + echo Sitemap generator is disabled
web_1            | + nice -n 20 runuser -c /mwtranscoder.sh -s /bin/bash www-data
web_1            | Sitemap generator is disabled
web_1            | + nice -n 20 runuser -c /mwjobrunner.sh -s /bin/bash www-data
web_1            | Starting transcoder...
web_1            | Starting job runner...
...

[github-actions]

Image is built and pushed to the repository as ghcr.io/canastawiki/canasta:latest,ghcr.io/canastawiki/canasta:1.1.0,ghcr.io/canastawiki/canasta:1.35-latest,ghcr.io/canastawiki/canasta:1.35.6-latest,ghcr.io/canastawiki/canasta:1.35.6-20220609-9d5a567