ci: refactor and optimize GitHub Actions workflows (#146)

* ci: refactor and optimize GitHub Actions workflows\n\n- **Consolidate build processes (`build.yml`, `release.yml`)**: Merged the standalone `.zip` (linux-build) and `.deb` (deb-build) jobs into a single matrix job (`build-and-package` / `build-release`).
  This prevents compiling the Rust binaries twice per architecture, effectively cutting the build time in half and saving CI runner minutes.
    - **Parallelize and fix Flatpak deployment (`flatter.yml`)**:
      - Converted `x86_64` and `aarch64` flatpak jobs to run concurrently via a matrix strategy, removing the sequential bottleneck.
      - Resolved an issue where GitHub Pages would only host the `aarch64` repository. Introduced a new `prepare-repo` job that downloads the `.flatpak` bundles from both architectures, merges them into a
  single OSTree repository locally, signs it with GPG, and deploys the unified multi-arch repository to GitHub Pages.
      - Configured `flatter.yml` to automatically attach the offline `.flatpak` bundles to GitHub Releases when triggered by a release event.
    - **Toolchain and cleanup**: Switched hardcoded Rust toolchain version (`1.96.0`) to `stable` across all workflows to prevent manual bumps in the future. Simplified bash scripts and removed redundant
  dependency installation steps.

* Extract Copr trigger into a separate job: Copr build now starts immediately in parallel with GitHub Actions builds, eliminating unnecessary waiting time.

* use ubuntu 22.04 to build binaries instead of ubuntu-latest

* fix cache poisoning

* another attemp to fix cache poisoning

* disable cache in setup-rust-toolchain

* use ubuntu-latest

* optimize dependencies in debug profile

* remove --release flag from build.yml and CARGO env vars

* fix flatter names collision

* better flatter key changing

* auto formatting

* add auto updating cargo-sources for dependabot pull requests

* add groups to dependabot.yml

* add github-actions to dependabot

* add ppa deb repo

* add concurrency: gh-pages-deploy

.github/workflows/build.yml

@@ -12,7 +12,7 @@ on:
   workflow_dispatch:
 
 jobs:
-  linux-build:
+  build-and-package:
     strategy:
       matrix:
         include:
@@ -43,22 +43,19 @@ jobs:
       - name: Setup Rust toolchain
         uses: actions-rust-lang/setup-rust-toolchain@v1
         with:
-          toolchain: 1.96.0
+          toolchain: stable
+          cache: false
 
       - name: Rust Cache
         uses: swatinem/rust-cache@v2
+        with:
+          prefix-key: "v3-${{ matrix.runner }}"
 
       - name: Run tests
         run: cargo test --locked
 
-      - name: Build all binaries (debug-speed compilation into target/release)
-        env:
-          CARGO_PROFILE_RELEASE_OPT_LEVEL: 0
-          CARGO_PROFILE_RELEASE_DEBUG: "true"
-          CARGO_PROFILE_RELEASE_STRIP: "false"
-          CARGO_PROFILE_RELEASE_LTO: "false"
-          CARGO_PROFILE_RELEASE_CODEGEN_UNITS: 256
-        run: cargo build --release --locked
+      - name: Build all binaries
+        run: cargo build --locked
 
       - name: Extract all binary names
         id: cargo-meta
@@ -70,7 +67,7 @@ jobs:
           echo "$BIN_NAMES" >> $GITHUB_OUTPUT
           echo "EOF" >> $GITHUB_OUTPUT
 
-      - name: Package all binaries into one archive
+      - name: Package ZIP archive
         shell: bash
         run: |
           set -euo pipefail
@@ -81,7 +78,7 @@ jobs:
           FILES=()
           while IFS= read -r BIN; do
             [ -z "$BIN" ] && continue
-            FILES+=("target/release/$BIN")
+            FILES+=("target/debug/$BIN")
           done <<< "${{ steps.cargo-meta.outputs.bin_names }}"
 
           if [ "${#FILES[@]}" -eq 0 ]; then
@@ -89,67 +86,15 @@ jobs:
             exit 1
           fi
 
-          for f in "${FILES[@]}"; do
-            if [ ! -f "$f" ]; then
-              echo "Error: expected binary not found: $f" >&2
-              exit 1
-            fi
-            echo "Will add: $f"
-          done
-
           zip -j "$ARCHIVE_NAME" "${FILES[@]}"
 
-      - name: Upload archive as artifact
+      - name: Upload ZIP artifact
         uses: actions/upload-artifact@v4
         with:
           name: archive-${{ matrix.arch }}
           path: pwsp-*.zip
           retention-days: 7
 
-  deb-build:
-    strategy:
-      matrix:
-        include:
-          - arch: x64
-            runner: ubuntu-latest
-          - arch: arm64
-            runner: ubuntu-24.04-arm
-      fail-fast: false
-    runs-on: ${{ matrix.runner }}
-
-    steps:
-      - name: Install apt deps (dev-libs)
-        run: |
-          sudo apt-get update
-          sudo apt-get install -y \
-            libpipewire-0.3-dev \
-            libclang-dev \
-            libasound2-dev \
-            libdbus-1-dev \
-            pkg-config
-
-      - name: Checkout code
-        uses: actions/checkout@v4
-        with:
-          fetch-depth: 0
-
-      - name: Setup Rust toolchain
-        uses: actions-rust-lang/setup-rust-toolchain@v1
-        with:
-          toolchain: 1.96.0
-
-      - name: Rust Cache
-        uses: swatinem/rust-cache@v2
-
-      - name: Build all binaries (debug-speed compilation into target/release)
-        env:
-          CARGO_PROFILE_RELEASE_OPT_LEVEL: 0
-          CARGO_PROFILE_RELEASE_DEBUG: "true"
-          CARGO_PROFILE_RELEASE_STRIP: "false"
-          CARGO_PROFILE_RELEASE_LTO: "false"
-          CARGO_PROFILE_RELEASE_CODEGEN_UNITS: 256
-        run: cargo build --release --locked
-
       - name: Cache cargo-deb
         id: cache-cargo-deb
         uses: actions/cache@v4
@@ -161,14 +106,14 @@ jobs:
         if: steps.cache-cargo-deb.outputs.cache-hit != 'true'
         run: cargo install --locked cargo-deb
 
-      - name: Create .deb package (debug binaries from target/release)
+      - name: Create .deb package
         shell: bash
         run: |
           set -euo pipefail
           export PATH="$HOME/.cargo/bin:$PATH"
-          cargo-deb -p pwsp-gui --no-build --no-strip
+          cargo-deb -p pwsp-gui --no-build --no-strip --profile dev
 
-      - name: Upload .deb(s) as artifacts
+      - name: Upload .deb artifact
         uses: actions/upload-artifact@v4
         with:
           name: deb-packages-${{ matrix.arch }}