Fix Fedora build

Fedora builds were broken due to dotnet-sdk-3.1 and dotnet-runtime-3.1 not being available on the @dotnet-sig/dotnet repo as well as a lack of the git package (needed for yarn when installing jellyfin/jellyfin-noto per https://github.com/jellyfin/jellyfin-web/pull/735). Replaces the outdated repo with the official repo found in Microsoft's documentation.

deployment/fedora-package-x64/Dockerfile

@@ -12,11 +12,11 @@ ENV ARTIFACT_DIR=/dist
 RUN dnf update -y
 
 # Install build dependencies
-RUN dnf install -y @buildsys-build rpmdevtools dnf-plugins-core libcurl-devel fontconfig-devel freetype-devel openssl-devel glibc-devel libicu-devel nodejs-yarn
+RUN dnf install -y @buildsys-build rpmdevtools git dnf-plugins-core libcurl-devel fontconfig-devel freetype-devel openssl-devel glibc-devel libicu-devel nodejs-yarn
 
 # Install DotNET SDK
-RUN dnf copr enable -y @dotnet-sig/dotnet \
- && rpmdev-setuptree \
+RUN rpm --import https://packages.microsoft.com/keys/microsoft.asc \
+ && curl -o /etc/yum.repos.d/microsoft-prod.repo https://packages.microsoft.com/config/fedora/$(rpm -E %fedora)/prod.repo \
  && dnf install -y dotnet-sdk-${SDK_VERSION} dotnet-runtime-${SDK_VERSION}
 
 # Create symlinks and directories