[CI] Build packages for AlmaLinux 8

Signed-off-by: Wojtek Porczyk <[email protected]>

.ci/almalinux8.dockerfile

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+FROM almalinux:8
+
+RUN dnf install -y \
+    'dnf-command(config-manager)' \
+    epel-release \
+    git \
+    jq \
+    rpm-build
+RUN dnf config-manager --set-enabled -y powertools
+
+# NOTE: COPY invalidates docker cache when source file changes,
+# so `dnf builddep` will rerun if dependencies change, despite no change
+# in dockerfile.
+COPY gramine.spec /gramine.spec
+RUN dnf builddep -y /gramine.spec

.ci/pkg-rpm-almalinux8.jenkinsfile

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+pipeline {
+    agent any
+    stages {
+        stage('makedist') {
+            agent {
+                dockerfile {
+                    filename '.ci/almalinux8.dockerfile'
+                    reuseNode true
+                }
+            }
+            steps {
+                sh '''
+                    ./scripts/makedist.sh
+                    mkdir -p rpmbuild/SOURCES
+                    mv gramine*.tar.* rpmbuild/SOURCES
+                '''
+            }
+        }
+        stage('build') {
+            agent {
+                dockerfile {
+                    filename '.ci/almalinux8.dockerfile'
+                    args '--network=none'
+                    reuseNode true
+                }
+            }
+            steps {
+                sh '''
+                    rpmbuild \
+                        --define "_topdir $PWD/rpmbuild" \
+                        -ba gramine.spec
+                '''
+            }
+        }
+    }
+    post {
+        always {
+            archiveArtifacts '''
+                rpmbuild/SRPMS/gramine*.src.rpm,
+                rpmbuild/RPMS/*/gramine*.rpm,
+            '''
+        }
+    }
+}