fix(ci): add GTK4 system deps, pip install ., and contents:write to packaging workflows

- Merged GTK4/Cairo/gobject-introspection system dependencies with packaging
  tools so pycairo and PyGObject can build from source
- Added pip install . to install all pyproject.toml runtime dependencies
  before running the build scripts
- Added permissions: contents: write for softprops/action-gh-release when
  generate_release_notes is true

Author: Peter-L-SVK

.github/workflows/build-deb.yml

@@ -17,24 +17,34 @@ jobs:
     name: Build DEB Package
     runs-on: ubuntu-latest
     permissions:
-      contents: write 
+      contents: write
+
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
 
-      - name: Install DEB build tools
+      - name: Install system dependencies (GTK4 + build tools)
         run: |
           sudo apt-get update
           sudo apt-get install -y \
+            libgtk-4-dev \
+            libgtksourceview-5-dev \
+            libcairo2-dev \
+            libgirepository-2.0-dev \
+            gobject-introspection \
+            gir1.2-gtk-4.0 \
+            gir1.2-gtksource-5 \
+            python3-dev \
+            python3-gi \
+            python3-gi-cairo \
+            libffi-dev \
+            libssl-dev \
+            pkg-config \
             build-essential \
             debhelper \
             devscripts \
             dpkg-dev \
-            fakeroot \
-            python3 \
-            python3-pip \
-            python3-setuptools \
-            python3-dev
+            fakeroot
 
       - name: Set up Python
         uses: actions/setup-python@v5
@@ -45,9 +55,7 @@ jobs:
         run: |
           pip install --upgrade pip
           pip install build
-
-      - name: Install project dependencies
-        run: pip install .
+          pip install .
 
       - name: Build DEB
         run: |

.github/workflows/build-rpm.yml

@@ -18,21 +18,31 @@ jobs:
     runs-on: ubuntu-latest
     permissions:
       contents: write
+
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
 
-      - name: Install RPM build tools
+      - name: Install system dependencies (GTK4 + build tools)
         run: |
           sudo apt-get update
           sudo apt-get install -y \
+            libgtk-4-dev \
+            libgtksourceview-5-dev \
+            libcairo2-dev \
+            libgirepository-2.0-dev \
+            gobject-introspection \
+            gir1.2-gtk-4.0 \
+            gir1.2-gtksource-5 \
+            python3-dev \
+            python3-gi \
+            python3-gi-cairo \
+            libffi-dev \
+            libssl-dev \
+            pkg-config \
             rpm \
             rpm2cpio \
-            cpio \
-            python3 \
-            python3-pip \
-            python3-setuptools \
-            python3-dev
+            cpio
 
       - name: Set up Python
         uses: actions/setup-python@v5
@@ -43,9 +53,7 @@ jobs:
         run: |
           pip install --upgrade pip
           pip install build
-
-      - name: Install project dependencies
-        run: pip install .
+          pip install .
 
       - name: Build RPM
         run: |