ci: migrate from focal to jammy, el8

Problem: focal CI builds are failing.

There seems to be a linkage problem with libjansson in the
fluxrm/flux-core:focal image.

Move most focal builders to jammy.

There seems to be a problem with the configure script generated
for ompi 2.x and 3.x in jammy:

checking for struct sockaddr_in... yes
checking if --with-cuda is set... not set (--with-cuda=)
./configure: line 13031: syntax error near unexpected token `)'
./configure: line 13031: `    )'

Move those builders to el8.

Tidy up builder descriptions.

.github/workflows/main.yml

@@ -22,28 +22,28 @@ jobs:
     strategy:
       matrix:
         include:
-        - name: "focal - ompi v5.0.x, chain_lint"
-          image: "focal"
+        - name: "jammy - chain_lint"
+          image: "jammy"
           ompi_branch: "v5.0.0rc12"
           openpmix_branch: "v4.2.3"
           coverage: false
           env:
             chain_lint: t
-        - name: "el8 - ompi v5.0.x, distcheck"
+        - name: "el8 - distcheck"
           image: "el8"
           ompi_branch: "v5.0.0rc12"
           openpmix_branch: "v4.2.3"
           coverage: false
           env:
             DISTCHECK: t
-        - name: "el8 - pmix v3.2.3, ompi v4.1.4"
+        - name: "el8 - ompi v4.1.4"
           image: "el8"
           ompi_branch: "v4.1.4"
           openpmix_branch: "v3.2.3"
           coverage: false
           env: {}
-        - name: "coverage"
-          image: "focal"
+        - name: "jammy - coverage"
+          image: "jammy"
           ompi_branch: "v5.0.0rc12"
           openpmix_branch: "v4.2.3"
           coverage: true
@@ -55,26 +55,26 @@ jobs:
           openpmix_branch: "v4.2.3"
           coverage: false
           env: {}
-        - name: "focal - ompi v4.1.x"
-          image: "focal"
+        - name: "jammy - ompi v4.1.x"
+          image: "jammy"
           ompi_branch: "v4.1.x"
           openpmix_branch: "v4.2.2"
           coverage: false
           env: {}
-        - name: "focal - ompi v4.0.x"
-          image: "focal"
+        - name: "jammy - ompi v4.0.x"
+          image: "jammy"
           ompi_branch: "v4.0.x"
           openpmix_branch: "v4.2.2"
           coverage: false
           env: {}
-        - name: "focal - ompi v3.1.x"
-          image: "focal"
+        - name: "el8 - ompi v3.1.x"
+          image: "el8"
           ompi_branch: "v3.1.x"
           openpmix_branch: "v4.2.2"
           coverage: false
           env: {}
-        - name: "focal - ompi v3.0.x"
-          image: "focal"
+        - name: "el8 - ompi v3.0.x"
+          image: "el8"
           ompi_branch: "v3.0.x"
           openpmix_branch: "v4.2.2"
           coverage: false

src/test/docker/jammy/Dockerfile

@@ -0,0 +1,63 @@
+FROM fluxrm/flux-core:jammy
+
+ARG USER=fluxuser
+ARG UID=1000
+ARG OMPI_BRANCH=v5.0.x
+ARG OPENPMIX_BRANCH=v4.2.4
+
+RUN \
+ if test "$USER" != "fluxuser"; then  \
+      sudo groupadd -g $UID $USER \
+   && sudo useradd -g $USER -u $UID -d /home/$USER -m $USER \
+   && sudo sh -c "printf \"$USER ALL= NOPASSWD: ALL\\n\" >> /etc/sudoers" \
+   && sudo adduser $USER sudo ; \
+ fi
+
+# remove installed mpich
+RUN sudo apt purge -yy mpich libmpich-dev \
+ && sudo apt clean
+
+# remove mca dir from hand-installed openpmix which will be overwritten below
+RUN sudo rm -rf /usr/lib/pmix
+
+# install ompi prereqs
+RUN sudo apt-get update \
+ && sudo apt-get -qq install -y --no-install-recommends \
+    libevent-dev \
+    flex \
+    openssh-client \
+ && sudo apt clean \
+ && sudo rm -rf /var/lib/apt/lists/*
+
+# build/install openpmix
+RUN cd /tmp \
+ && git clone -b ${OPENPMIX_BRANCH} \
+      --recursive --depth=1 https://github.com/openpmix/openpmix \
+ && cd openpmix \
+ && git branch \
+ && ./autogen.pl \
+ && ./configure --prefix=/usr \
+      --enable-debug --disable-sphinx \
+ && make -j $(nproc) \
+ && sudo make install \
+ && cd .. \
+ && rm -rf openpmix
+
+# build/install ompi
+RUN cd /tmp \
+ && git clone -b ${OMPI_BRANCH} \
+      --recursive --depth=1 https://github.com/open-mpi/ompi \
+ && cd ompi \
+ && git branch \
+ && ./autogen.pl \
+ && ./configure --prefix=/usr \
+      --disable-man-pages --enable-debug --enable-mem-debug \
+      --with-pmix=external --with-libevent --disable-sphinx \
+ && make -j $(nproc) \
+ && sudo make install \
+ && cd .. \
+ && rm -rf ompi
+
+USER $USER
+WORKDIR /home/$USER
+