Add Fedora 39 builder

The builder will be used to build nightly and release versions of ponyc
targetting Fedora 39.

No release notes are being added at this time, nor is RELEASE_PROCESS.md
being updated as until a nightly runs, we can't be sure this will fully work.

.ci-dockerfiles/x64-64-unknown-linux-fedora39-buiilder/Dockerfile

@@ -0,0 +1,20 @@
+FROM fedora:39
+
+RUN dnf install -y clang \
+  cmake \
+  git \
+  make \
+  zlib \
+  curl \
+  python3-pip \
+  lldb \
+  libstdc++-static \
+ && pip3 install cloudsmith-cli
+
+# needed for GitHub actions
+RUN git config --global --add safe.directory /__w/ponyc/ponyc
+
+# add user pony in order to not run tests as root
+RUN useradd -u 1001 -ms /bin/bash -d /home/pony -g root pony
+USER pony
+WORKDIR /home/pony

.ci-dockerfiles/x64-64-unknown-linux-fedora39-buiilder/build-and-push.bash

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+set -o errexit
+set -o nounset
+
+#
+# *** You should already be logged in to GHCR when you run this ***
+#
+
+NAME="ghcr.io/ponylang/ponyc-ci-x86-64-unknown-linux-fedora39-builder"
+TODAY=$(date +%Y%m%d)
+DOCKERFILE_DIR="$(dirname "$0")"
+
+docker build --pull -t "${NAME}:${TODAY}" "${DOCKERFILE_DIR}"
+docker push "${NAME}:${TODAY}"

.github/workflows/nightlies.yml

@@ -24,6 +24,10 @@ jobs:
             name: x86-64-unknown-linux-musl
             triple-os: linux-musl
             triple-vendor: unknown
+          - image: ghcr.io/ponylang/ponyc-ci-x86-64-unknown-linux-fedora39-builder:20240128
+            name: x86-64-unknown-linux-fedora39
+            triple-os: linux-fedora39
+            triple-vendor: unknown
 
     name: ${{ matrix.name }}
     container:

.github/workflows/release.yml

@@ -47,6 +47,10 @@ jobs:
             name: x86-64-unknown-linux-musl
             triple-os: linux-musl
             triple-vendor: unknown
+          - image: ghcr.io/ponylang/ponyc-ci-x86-64-unknown-linux-fedora39-builder:20240128
+            name: x86-64-unknown-linux-fedora39
+            triple-os: linux-fedora39
+            triple-vendor: unknown
 
     name: ${{ matrix.name }}
     container: