Packaging: Added docker script to build a snap package

Issue #37

packaging/snap/Makefile

@@ -0,0 +1,10 @@
+all:
+	docker run --rm -id --workdir=/snap --name=qjournalctl-snap --volume=$(realpath .):/out ubuntu
+	touch qjournalctl_0.6_amd64.snap
+
+	docker exec -i qjournalctl-snap apt-get update
+	docker exec -i qjournalctl-snap apt-get -y install snapd snapcraft
+
+	docker cp snapcraft.yaml qjournalctl-snap:/snap/
+	docker exec -i qjournalctl-snap snapcraft
+	docker exec -i qjournalctl-snap bash -c 'cp /snap/*.snap /out'

packaging/snap/snapcraft.yaml

@@ -0,0 +1,52 @@
+name: qjournalctl
+version: "0.6"
+summary: A Qt-based Graphical User Interface for systemd's journalctl command
+description: |
+  A Qt-based Graphical User Interface for
+  systemd's journalctl command
+
+base: core18
+confinement: classic
+
+parts:
+  qjournalctl:
+    plugin: qmake
+    qt-version: qt5
+
+    source-type: tar
+    source: https://github.com/pentix/qjournalctl/archive/v0.6.tar.gz
+
+    override-build: |
+        wget https://www.libssh.org/files/0.9/libssh-0.9.0.tar.xz
+        tar xf libssh-0.9.0.tar.xz
+        cd libssh-0.9.0
+        
+        mkdir build
+        cd build
+        cmake -DCMAKE_INSTALL_PREFIX=/snap/parts/qjournalctl/install/ ..
+        make install -j$(nproc)
+        
+        cd ../..
+        
+        PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/snap/parts/qjournalctl/install/lib/pkgconfig/ QT_SELECT=qt5 qmake qjournalctl.pro -r -spec linux-g++ CONFIG+=release QMAKE_LIBDIR=/snap/parts/qjournalctl/install/lib/
+
+        make install -j$(nproc)
+
+    build-packages:
+      - build-essential
+      - libssl-dev
+      - libzip-dev
+      - pkg-config
+      - g++
+      - make
+      - cmake
+      - wget
+      - qtbase5-dev
+
+    stage-packages:
+      - qtbase5-dev
+
+apps:
+  qjournalctl:
+    command: qjournalctl
+