Snap GitHub ci (#5379)

* Build snap from java package

* add snap to github ci

* Use docker snapcraft

* Add container to ubuntu matrix item

* move snap workflow to matrix

* add matrix to snapbuild

* add transfer.sh link

* Use tar from build/distribution

* Add stable snapcraft

* Remove explicit container

* Attempt at a github actions integration

* Try to make it work...

* Try to fix ?

* Build without docker

* Build with latest docker

* Add docker image based on bionic

* Temporarily revert to version-script

* Uncomment upload to builds.jabref

* Make sure to move only jabref snap to build folder

* Update and rename deployment.yml to snap-deployment.yml

Modify to push again

* Update and rename snap-deployment.yml to deployment.yml

* Reenable checks for PRs

* Temporarily disable master branch check to test

* I'm tired...

* Fix branch name detection for PRs

* Try to fix branch name detection

* Update deployment.yml

* Update deployment.yml

* Remove on PR

.github/workflows/deployment.yml

@@ -34,6 +34,14 @@ jobs:
       with:
         depth: 1
         submodules: true
+    - name: Extract branch name
+      shell: bash
+      run: |
+         ref=${GITHUB_REF#refs/heads/}
+         ref=${ref#refs/pull/}
+         ref=${ref%/merge}
+         echo "##[set-output name=branch;]${ref}"
+      id: extract_branch
     - name: Set up JDK
       uses: actions/setup-java@v1
       with:
@@ -75,10 +83,14 @@ jobs:
     - name: Package application image
       run: ${{ matrix.archivePortable }}
       shell: bash
-    - name: Extract branch name
+    - name: Build and publish snap
+      if: matrix.os == 'ubuntu-latest' && steps.extract_branch.outputs.branch == 'master'
+      env:
+        SNAPCRAFT_LOGIN_FILE: ${{ secrets.SNAPCRAFT_LOGIN_FILE }}
+      run: |
+          docker run -v $(pwd):$(pwd) -t lyzardking/snapcraft-bionic sh -c "apt update -qq && cd $(pwd) && snapcraft && mv jabref*.snap build/distribution/"
+          # cd build/distribution/ && mdkir .snapcraft && echo ${SNAPCRAFT_LOGIN_FILE} | base64 --decode --ignore-garbage > .snapcraft/snapcraft.cfg && snapcraft push --release=beta *.snap
       shell: bash
-      run: echo "##[set-output name=branch;]$(echo ${GITHUB_REF#refs/heads/})"
-      id: extract_branch
     - name: Upload to builds.jabref.org
       uses: garygrossgarten/github-action-scp@release
       with: