[CI] Add AlmaLinux 8 pipeline

.ci/almalinux-8.dockerfile

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+FROM almalinux/almalinux:8
+
+RUN dnf -y update && dnf -y install \
+    autoconf \
+    bison \
+    gawk \
+    meson \
+    python3-click \
+    python3-jinja2 \
+&& dnf clean all
+
+# Add the user UID:1001, GID:1001, home at /leeroy
+RUN \
+    groupadd -r leeroy -g 1001 && \
+    useradd -u 1001 -r -g leeroy -m -d /leeroy -c "Leeroy Jenkins" leeroy && \
+    chmod 755 /leeroy
+
+# Make sure /leeroy can be written by leeroy
+RUN chown 1001 /leeroy
+
+# Blow away any random state
+RUN rm -f /leeroy/.rnd
+
+# Make a directory for the intel driver
+RUN mkdir -p /opt/intel && chown 1001 /opt/intel
+
+# Set the working directory to leeroy home directory
+WORKDIR /leeroy
+
+# Specify the user to execute all commands below
+USER leeroy
+
+# Set environment variables.
+ENV HOME /leeroy
+
+# Define default command.
+CMD ["bash"]

.ci/lib/config-almalinux8.jenkinsfile

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+env.GLIBC_VERSION = '2.33'
+env.PYTHONVERSION = 'python3.6'

.ci/linux-direct-rhel8-gcc-release.jenkinsfile

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+node('nonsgx_slave') {
+    checkout scm
+
+    load '.ci/lib/config-docker.jenkinsfile'
+    docker.build(
+        "local:${env.BUILD_TAG}",
+        '-f .ci/almalinux-8.dockerfile .'
+    ).inside("${env.DOCKER_ARGS_COMMON}") {
+        load '.ci/lib/config.jenkinsfile'
+        load '.ci/lib/config-almalinux8.jenkinsfile'
+        load '.ci/lib/config-release.jenkinsfile'
+
+        load '.ci/lib/stage-lint.jenkinsfile'
+        load '.ci/lib/stage-clean-check-prepare.jenkinsfile'
+        load '.ci/lib/stage-build-nosgx.jenkinsfile'
+        load '.ci/lib/stage-test.jenkinsfile'
+        load '.ci/lib/stage-test-direct.jenkinsfile'
+        load '.ci/lib/stage-clean-check.jenkinsfile'
+    }
+}