format,ci: update clang-format to clang16

.github/workflows/everything.yml

@@ -66,7 +66,7 @@ jobs:
 
     runs-on: ubuntu-latest
     container:
-      image: ornladios/adios2:ci-formatting
+      image: ghcr.io/ornladios/adios2:ci-formatting
 
     steps:
       - uses: actions/checkout@v3

scripts/ci/images/formatting/Dockerfile

@@ -1,15 +1,16 @@
-FROM ubuntu:20.04
+FROM fedora:38
 
-RUN apt update && \
-    DEBIAN_FRONTEND="noninteractive" apt upgrade -y --no-install-recommends && \
-    DEBIAN_FRONTEND="noninteractive" apt install -y --no-install-recommends \
-    apt-utils \
-    ca-certificates \
-    clang-format-7 \
+RUN dnf update -y && \
+    dnf install -y \
+    clang-tools-extra \
     curl \
-    flake8 \
     git \
-    libtinfo5 \
-    shellcheck \
+    python3-flake8 \
+    ShellCheck \
     && \
-    apt-get clean
+    dnf clean all
+
+# Check that the target programs has been installed
+RUN command -v clang-format > /dev/null && \
+    command -v flake8 > /dev/null && \
+    command -v shellcheck > /dev/null