CICD: Update AppImage Workflow to Be Based on ubuntu 20.04 Image.

Update the AppImage workflow to be based on ubuntu 20.04 in order to
support the updated requirement of GitHub actions to run on node 20.

Signed-off-by: Michael Keller <github@ike.ch>

.github/workflows/linux-debian-trixie-5.15.yml

@@ -1,4 +1,4 @@
-name: Debian trixie / Qt 5.15--
+name: Debian trixie / Qt 5
 
 on:
   push:

.github/workflows/linux-fedora-35-qt6.yml

@@ -1,4 +1,4 @@
-name: Fedora 35 / Qt 6--
+name: Fedora 35 / Qt 6
 
 on:
   push:

.github/workflows/linux-ubuntu-20.04-qt5-appimage.yml

@@ -1,4 +1,4 @@
-name: Ubuntu 16.04 / Qt 5.15-- for AppImage
+name: Ubuntu 20.04 / Qt 5 for AppImage
 
 on:
   push:
@@ -16,7 +16,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     container:
-      image: ubuntu:16.04
+      image: ubuntu:20.04
 
     steps:
     - name: get container ready for build
@@ -24,27 +24,10 @@ jobs:
         echo "--------------------------------------------------------------"
         echo "update distro and install dependencies"
 
-        apt-get update
-        DEBIAN_FRONTEND=noninteractive apt-get install -y -q \
-        software-properties-common
-
-        add-apt-repository -y ppa:savoury1/qt-5-15
-        add-apt-repository -y ppa:savoury1/kde-5-80
-        add-apt-repository -y ppa:savoury1/gpg
-        add-apt-repository -y ppa:savoury1/ffmpeg4
-        add-apt-repository -y ppa:savoury1/vlc3
-        add-apt-repository -y ppa:savoury1/gcc-9
-        add-apt-repository -y ppa:savoury1/display
-        add-apt-repository -y ppa:savoury1/apt-xenial
-        add-apt-repository -y ppa:savoury1/gtk-xenial
-        add-apt-repository -y ppa:savoury1/qt-xenial
-        add-apt-repository -y ppa:savoury1/kde-xenial
-        add-apt-repository -y ppa:savoury1/backports
-        add-apt-repository -y ppa:savoury1/build-tools
         apt-get update
         apt-get dist-upgrade -y
         DEBIAN_FRONTEND=noninteractive apt-get install -y -q \
-        autoconf automake cmake g++ g++-9 git libcrypto++-dev libcurl4-gnutls-dev \
+        autoconf automake cmake g++ git libcrypto++-dev libcurl4-gnutls-dev \
         libgit2-dev libqt5qml5 libqt5quick5 libqt5svg5-dev \
         libqt5webkit5-dev libsqlite3-dev libssh2-1-dev libssl-dev libssl-dev \
         libtool libusb-1.0-0-dev libxml2-dev libxslt1-dev libzip-dev make \
@@ -52,15 +35,16 @@ jobs:
         qml-module-qtquick2 qt5-qmake qtchooser qtconnectivity5-dev \
         qtdeclarative5-dev qtdeclarative5-private-dev qtlocation5-dev \
         qtpositioning5-dev qtscript5-dev qttools5-dev qttools5-dev-tools \
-        qtquickcontrols2-5-dev xvfb libbluetooth-dev libmtp-dev liblzma-dev \
-        curl
-
-        update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-9 60 \
-        --slave /usr/bin/g++ g++ /usr/bin/g++-9
+        qtquickcontrols2-5-dev xvfb libbluetooth-dev libmtp-dev \
+        mdbtools-dev curl
 
+        git config --global user.email "ci@subsurface-divelog.org"
+        git config --global user.name "Subsurface CI"
+        git config --global --add safe.directory $GITHUB_WORKSPACE
+        git config --global --add safe.directory $GITHUB_WORKSPACE/libdivecomputer
+    # needs git from the previous step
     - name: checkout sources
-      # We cannot update this as glibc on 16.04 is too old for node 20.
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         fetch-depth: 0
         submodules: recursive
@@ -129,7 +113,7 @@ jobs:
     - name: PR artifacts
       if: github.event_name == 'pull_request'
       # We cannot update this as glibc on 16.04 is too old for node 20.
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: Subsurface-Linux-AppImage-${{ steps.version_number.outputs.version }}
         path: Subsurface-*.AppImage
@@ -138,7 +122,7 @@ jobs:
     # only publish a 'release' on push events (those include merging a PR)
     - name: upload binaries
       if: github.event_name == 'push'
-      uses: softprops/action-gh-release@v1
+      uses: softprops/action-gh-release@v2
       with:
         tag_name: v${{ steps.version_number.outputs.version }}
         repository: ${{ github.repository_owner }}/nightly-builds

.github/workflows/linux-ubuntu-20.04-qt5.yml

@@ -1,4 +1,4 @@
-name: Ubuntu 20.04 / Qt 5.12--
+name: Ubuntu 20.04 / Qt 5
 
 on:
   push:

.github/workflows/linux-ubuntu-22.04-qt5.yml

@@ -1,4 +1,4 @@
-name: Ubuntu 22.04 / Qt 5.15--
+name: Ubuntu 22.04 / Qt 5
 
 on:
   push:

.github/workflows/linux-ubuntu-24.04-qt5.yml

@@ -1,4 +1,4 @@
-name: Ubuntu 24.04 / Qt 5.15--
+name: Ubuntu 24.04 / Qt 5
 
 on:
   push: