Extend demo bnd-workspace for creation of executable jar via .bndrun

[chrisrueger]

• added a .bndrun in the demo.impl bundle which is used to build the executable jar (comparable to building the product)
• added another consumer bundle which
• installed Felix Gogo Shell, so that you can even start the application and type 'hello' in the console to get an output from the service. this is basically now a very simple OSGi application
• changed to Java17
• removed all warnings in Eclipse

mvn clean verify -Dtycho-version=5.0.0-SNAPSHOT

[INFO] bnd-parent ......................................... SUCCESS [  0.038 s]
[INFO] tycho.demo.api ..................................... SUCCESS [  1.409 s]
[INFO] tycho.demo.consumer ................................ SUCCESS [  1.127 s]
[INFO] tycho.demo.markdown ................................ SUCCESS [  1.469 s]
[INFO] tycho.demo.impl .................................... SUCCESS [  1.219 s]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------

In Eclipse you can start the .bndrun and also Export it as an executable jar like this:

The .bndrun can also be created and run for test and comparison purposes via the bnd command line:

cd demo/bnd-workspace
bnd export tycho.demo.impl/tycho.demo.app.bndrun

or just run it as a application:

bnd run tycho.demo.impl/tycho.demo.app.bndrun
which starts the app and shows the Felix Gogo Shell.

____________________________
Welcome to Apache Felix Gogo

g! Please type 'hello' into the console and press Enter, and magic will happen.

Then type 'hello'.

hello
Hello BND Workspace!
Render some markdown to HTML: <h2>H2 Headline</h2>

[github-actions]

Test Results

  606 files  ±0    606 suites  ±0   4h 0m 52s ⏱️ + 5m 42s
  434 tests ±0    426 ✅  - 1   7 💤 ±0  1 ❌ +1 
1 302 runs  ±0  1 279 ✅  - 1  22 💤 ±0  1 ❌ +1 

For more details on these failures, see this check.

Results for commit 0ccd052. ± Comparison against base commit 9330061.