Remove Ubuntu 23.04 Lunar Lobster Build (#5002)

* Delete .ci/UbuntuLunar directory

EOL

* Update release_template.md

Lunar is EOL

* Update desktop-build.yml

Lunar is EOL

.ci/UbuntuLunar/Dockerfile

@@ -1,27 +0,0 @@
-FROM ubuntu:lunar
-
-RUN apt-get update && \
-    DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
-        build-essential \
-        ccache \
-        clang-format \
-        cmake \
-        file \
-        g++ \
-        git \
-        libgl-dev \
-        liblzma-dev \
-        libmariadb-dev-compat \
-        libprotobuf-dev \
-        libqt6multimedia6 \
-        libqt6sql6-mysql \
-        qt6-svg-dev \
-        qt6-websockets-dev \
-        protobuf-compiler \
-        qt6-image-formats-plugins \
-        qt6-l10n-tools \
-        qt6-multimedia-dev \
-        qt6-tools-dev \
-        qt6-tools-dev-tools \
-    && apt-get clean \
-    && rm -rf /var/lib/apt/lists/*

.ci/release_template.md

@@ -15,7 +15,6 @@ include different targets -->
  - <kbd>Ubuntu 18.04 LTS</kbd> ("Bionic Beaver")
  - <kbd>Ubuntu 20.04 LTS</kbd> ("Focal Fossa")
  - <kbd>Ubuntu 22.04 LTS</kbd> ("Jammy Jellyfish")
- - <kbd>Ubuntu 23.04</kbd> ("Lunar Lobster")
  - <kbd>Debian 11</kbd> ("Bullseye")
  - <kbd>Debian 12</kbd> ("Bookworm")
  - <kbd>Fedora 38</kbd>

.github/workflows/desktop-build.yml

@@ -114,9 +114,6 @@ jobs:
             package: DEB
             test: skip # running tests on all distros is superfluous
 
-          - distro: UbuntuLunar
-            package: DEB
-
     name: ${{matrix.distro}}
     needs: configure
     runs-on: ubuntu-latest