Add flatpak manifest.

flatpak/tech.icedream.icecon.yml

@@ -0,0 +1,34 @@
+app-id: tech.icedream.icecon
+
+runtime: org.freedesktop.Platform
+runtime-version: '20.08'
+
+sdk: org.freedesktop.Sdk
+sdk-extensions:
+  - org.freedesktop.Sdk.Extension.golang
+
+command: icecon
+
+finish-args:
+  - --share=ipc # Share IPC namespace with the host (necessary for X11).
+  - --socket=x11
+  - --share=network
+
+build-options:
+  build-args:
+    - --share=network
+  env:
+    - GOBIN=/app/bin
+    - GOROOT=/usr/lib/sdk/golang
+
+modules:
+  - name: icecon
+    buildsystem: simple
+    build-commands:
+      - $GOROOT/bin/go mod download
+      - $GOROOT/bin/go generate -v ./...
+      - $GOROOT/bin/go build -v -ldflags '-s -w' -o icecon
+      - install -Dm00755 icecon $FLATPAK_DEST/bin/icecon
+    sources:
+      - type: dir
+        path: ../