add Launchpad PPA build

Could it be this easy? There's no way it's this easy.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

.github/workflows/fedora-copr-build.yml

@@ -3,7 +3,6 @@ on:
   push:
     branches:
     - master
-    - github-action-test
   pull_request:
     branches:
     - master

.github/workflows/ubuntu-launchpad-build.yml

@@ -0,0 +1,47 @@
+name: Ubuntu Launchpad Build
+on:
+  push:
+    branches:
+    - master
+    - github-action-test
+  pull_request:
+    branches:
+    - master
+
+jobs:
+  push-to-ppa:
+
+    name: Submit build to Ubuntu Launchpad
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Check out sources
+      uses: actions/checkout@v1
+
+    - name: Setup build dependencies
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y devscripts dput gpg debhelper qt5-qmake cmake
+
+    - name: Setup gpg key token for launchpad
+      env:
+        GPG_PRIVATE_KEY: ${{ secrets.PPA_SECRET_KEY }}
+      run: |
+        echo "$GPG_PRIVATE_KEY" > ~/.key
+        gpg --import ~/.key
+
+    - name: setup git
+      run: |
+        git config --global --add safe.directory /__w/subsurface/subsurface
+        git config --global --add safe.directory /__w/subsurface/subsurface/libdivecomputer
+
+    - name: Checkout googlemaps
+      run: |
+        cd ..
+        git clone https://github.com/subsurface/googlemaps
+
+    - name: run the launchpad make-package script
+      run: |
+        cd ..
+        bash -x subsurface/packaging/ubuntu/make-package.sh post
+