add ubuntu 20.10 Groovy Gorilla (#4178)

.ci/UbuntuGroovy/Dockerfile

@@ -0,0 +1,25 @@
+FROM ubuntu:groovy
+
+RUN apt-get update && \
+    DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
+        build-essential \
+        ccache \
+        clang-format \
+        cmake \
+        file \
+        g++ \
+        git \
+        liblzma-dev \
+        libmariadb-dev-compat \
+        libprotobuf-dev \
+        libqt5multimedia5-plugins \
+        libqt5sql5-mysql \
+        libqt5svg5-dev \
+        libqt5websockets5-dev \
+        protobuf-compiler \
+        qt5-default \
+        qtmultimedia5-dev \
+        qttools5-dev \
+        qttools5-dev-tools \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*

.github/workflows/linux-builds.yml

@@ -17,12 +17,16 @@ jobs:
       fail-fast: false
       matrix:
         distro: # these names correspond to the files in .ci/$distro
+          - UbuntuGroovy
           - UbuntuFocal
           - UbuntuBionic
           - ArchLinux
           - DebianBuster
           - Fedora33
         include:
+          - distro: UbuntuGroovy
+            package: DEB
+
           - distro: UbuntuFocal
             package: DEB
             test: skip # UbuntuFocal has a broken qt for debug builds