Add new "modern" elementaryOS template

templates/elementaryos/.editorconfig

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+# EditorConfig <https://EditorConfig.org>
+root = true
+
+# elementary defaults
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = tab
+indent_style = space
+insert_final_newline = true
+max_line_length = 80
+tab_width = 4
+
+# Markup files
+[{*.html,*.xml,*.xml.in,*.yml}]
+tab_width = 2

templates/elementaryos/.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: [ main ]
+
+  pull_request:
+    branches: [ main ]
+    types:
+      - opened
+      - reopened
+      - synchronize
+
+jobs:
+  flatpak:
+    name: Flatpak
+    runs-on: ubuntu-latest
+
+    container:
+      image: ghcr.io/elementary/flatpak-platform/runtime:daily
+      options: --privileged
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Build
+        uses: bilelmoussaoui/flatpak-github-actions/flatpak-builder@v4
+        with:
+          bundle: ${PROGRAM_NAME}.flatpak
+          manifest-path: com.github.${USERNAME}.${PROGRAM_NAME}.yml
+          run-tests: true
+          repository-name: appcenter
+          repository-url: https://flatpak.elementary.io/repo.flatpakrepo
+          cache-key: "flatpak-builder-${{ github.sha }}"
+
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+
+    container:
+      image: valalang/lint
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Lint
+        run: io.elementary.vala-lint -d .

templates/elementaryos/README.md

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+# ${PROJECT_NAME}
+
+${PROJECT_SUMMARY}
+
+## Building, Testing, and Installation
+
+You'll need the following dependencies to build:
+* libgtk-4-dev
+* libgranite-7-dev
+* meson
+* valac
+
+Run `meson build` to configure the build environment and run `ninja` to build
+```Bash
+    meson build --prefix=/usr
+    cd build
+    ninja
+```
+To install, use `ninja install`, then execute with `com.${USERNAME}.${PROGRAM_NAME}`
+```Bash
+    sudo ninja install
+    com.github.${USERNAME}.${PROGRAM_NAME}
+```

templates/elementaryos/com.github.${USERNAME}.${PROGRAM_NAME}.yml

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+# This is the same ID that you've used in meson.build and other files
+app-id: com.github.${USERNAME}.${PROGRAM_NAME}
+
+# Instead of manually specifying a long list of build and runtime dependencies,
+# we can use a convenient pre-made runtime and SDK. For this example, we'll be
+# using the runtime and SDK provided by elementary.
+runtime: io.elementary.Platform
+runtime-version: "8"
+sdk: io.elementary.Sdk
+
+# This should match the exec line in your .desktop file and usually is the same
+# as your app ID
+command: com.github.${USERNAME}.${PROGRAM_NAME}
+
+# Here we can specify the kinds of permissions our app needs to run. Since we're
+# not using hardware like webcams, making sound, or reading external files, we
+# only need permission to draw our app on screen using either X11 or Wayland.
+finish-args:
+  - "--share=ipc"
+  - "--socket=fallback-x11"
+  - "--socket=wayland"
+
+  # Needed to read prefers-color-scheme with Granite.Settings
+  - "--system-talk-name=org.freedesktop.Accounts"
+
+# This section is where you list all the source code required to build your app.
+# If we had external dependencies that weren't included in our SDK, we would list
+# them here.
+modules:
+  - name: ${PROGRAM_NAME}
+    buildsystem: meson
+    sources:
+      - type: dir
+        path: .