Fix: use a sha instead of 'refs/heads/master' as ref for deployments

When merging a second pull-request while the first has not created
a deployment yet, the 'refs/heads/master' resolves to the wrong
sha-hash, showing the wrong commit being deployed (it deploys the
commit of the first, while showing it did the one of the last).

Change: Publish also news post from the future to simplify posting. (O…

…penTTD#119)

Add post for 1.10.0-beta2

Fix: Add buster debs to file description list

Add: 1.10.0-beta1 release announcement (OpenTTD#108)

Add: Release 1.9.3 newspost (OpenTTD#100)

Fix: typo 'relase -> release' (OpenTTD#95)

Add: Monthly Dev Post of June/July 2019 (OpenTTD#88)

Release post for 1.9.2

Add: Monthly Dev Post of May 2019 (OpenTTD#72)