Add molecule test for Oracle Linux 7

.github/workflows/schedule_pg_oracle_linux7.yml

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+---
+# yamllint disable rule:truthy
+
+name: scheduled PostgreSQL (OracleLinux 7)
+
+on:
+  schedule:
+    - cron: '45 0 * * *'
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: checkout
+        uses: actions/checkout@v2
+
+      - name: Set up Python 3
+        uses: actions/setup-python@v2
+        with:
+          python-version: '3.x'
+
+      - name: Install dependencies
+        run: pip3 install molecule[docker] ansible
+
+      - name: Run Molecule tests
+        run: molecule test --scenario-name oraclelinux
+        env:
+          PY_COLORS: '1'
+          ANSIBLE_FORCE_COLOR: '1'
+          MOLECULE_DISTRO_TAG: 7
+
+...

molecule/oraclelinux/converge.yml

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+---
+- name: Converge
+  hosts: all
+  gather_facts: true
+
+  tasks:
+    - name: Set variables for molecule
+      set_fact:
+        firewall_enable_ipv6: false  # Added to prevent test failures in CI.
+        sysctl_set: false  # Added to prevent test failures in CI.
+        nameservers: ["8.8.8.8", "9.9.9.9"]
+        cacheable: true
+
+    - name: Prepare | Clean yum cache
+      command: yum clean all
+      args:
+        warn: false
+      when:
+        - ansible_os_family == "RedHat"
+        - ansible_distribution_major_version == '7'
+
+    - name: Prepare | Clean dnf cache
+      command: dnf clean all
+      args:
+        warn: false
+      when:
+        - ansible_os_family == "RedHat"
+        - ansible_distribution_major_version is version('8', '>=')
+
+    - name: Prepare | Check that sudo package is exists
+      package:
+        name: sudo
+
+- import_playbook: ../../deploy_pgcluster.yml
+
+...

molecule/oraclelinux/molecule.yml

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+---
+# yamllint disable rule:comments-indentation
+
+dependency:
+  name: galaxy
+  enabled: false
+driver:
+  name: docker
+platforms:
+  - name: 10.172.0.17
+    hostname: etcd01
+    image: robertdebock/oraclelinux:${MOLECULE_DISTRO_TAG:-7}
+    # docker_networks:  # TODO github.com/ansible-community/molecule/pull/2696
+      # - name: test_docker_network
+        # ipam_config:
+          # - subnet: 10.172.0.0/24
+            # gateway: 10.172.0.1
+    networks:
+      - name: test_docker_network
+        ipv4_address: 10.172.0.17
+    exposed_ports:
+      - 2379/tcp
+      - 2380/tcp
+    command: ""
+    volumes:
+      - /sys/fs/cgroup:/sys/fs/cgroup:ro
+    privileged: true
+    pre_build_image: true
+    env:
+      LANG: en_US.UTF-8
+      LC_ALL: en_US.UTF-8
+    groups:
+      - etcd_cluster
+
+  - name: 10.172.0.18
+    hostname: etcd02
+    image: robertdebock/oraclelinux:${MOLECULE_DISTRO_TAG:-7}
+    networks:
+      - name: test_docker_network
+        ipv4_address: 10.172.0.18
+    exposed_ports:
+      - 2379/tcp
+      - 2380/tcp
+    command: ""
+    volumes:
+      - /sys/fs/cgroup:/sys/fs/cgroup:ro
+    privileged: true
+    pre_build_image: true
+    env:
+      LANG: en_US.UTF-8
+      LC_ALL: en_US.UTF-8
+    groups:
+      - etcd_cluster
+
+  - name: 10.172.0.19
+    hostname: etcd03
+    image: robertdebock/oraclelinux:${MOLECULE_DISTRO_TAG:-7}
+    networks:
+      - name: test_docker_network
+        ipv4_address: 10.172.0.19
+    exposed_ports:
+      - 2379/tcp
+      - 2380/tcp
+    command: ""
+    volumes:
+      - /sys/fs/cgroup:/sys/fs/cgroup:ro
+    privileged: true
+    pre_build_image: true
+    env:
+      LANG: en_US.UTF-8
+      LC_ALL: en_US.UTF-8
+    groups:
+      - etcd_cluster
+
+  - name: 10.172.0.20
+    hostname: pgnode01
+    image: robertdebock/oraclelinux:${MOLECULE_DISTRO_TAG:-7}
+    networks:
+      - name: test_docker_network
+        ipv4_address: 10.172.0.20
+    exposed_ports:
+      - 8008/tcp
+      - 5432/tcp
+      - 6432/tcp
+    command: ""
+    volumes:
+      - /sys/fs/cgroup:/sys/fs/cgroup:ro
+    privileged: true
+    pre_build_image: true
+    env:
+      LANG: en_US.UTF-8
+      LC_ALL: en_US.UTF-8
+    groups:
+      - master
+      - postgres_cluster
+      - balancers
+
+  - name: 10.172.0.21
+    hostname: pgnode02
+    image: robertdebock/oraclelinux:${MOLECULE_DISTRO_TAG:-7}
+    networks:
+      - name: test_docker_network
+        ipv4_address: 10.172.0.21
+    exposed_ports:
+      - 8008/tcp
+      - 5432/tcp
+      - 6432/tcp
+    command: ""
+    volumes:
+      - /sys/fs/cgroup:/sys/fs/cgroup:ro
+    privileged: true
+    pre_build_image: true
+    env:
+      LANG: en_US.UTF-8
+      LC_ALL: en_US.UTF-8
+    groups:
+      - replica
+      - postgres_cluster
+      - balancers
+
+provisioner:
+  name: ansible
+  config_options:
+    defaults:
+      display_skipped_hosts: false
+      remote_tmp: "~/.ansible/tmp"
+      allow_world_readable_tmpfiles: false
+      timeout: 60
+  inventory:
+    links:
+      group_vars: ../../group_vars/
+  playbooks:
+    prepare: prepare.yml
+
+scenario:
+  create_sequence:
+    - prepare
+    - create
+  converge_sequence:
+    - prepare
+    - create
+    - converge
+  destroy_sequence:
+    - cleanup
+    - destroy
+  test_sequence:
+    - cleanup
+    - destroy
+    - syntax
+    - prepare
+    - create
+    - converge
+#    - idempotence  # >> role:patroni,task:"data directory check result"
+    - verify
+    - cleanup
+    - destroy
+
+verifier:
+  name: ansible
+  enabled: false  # TODO
+
+...

molecule/oraclelinux/prepare.yml

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+---
+- name: "Update docker network(s)"
+  hosts: localhost
+  gather_facts: false
+  become: false
+  tasks:
+    - name: "Create docker network: test_docker_network"
+      docker_network:
+        name: test_docker_network
+        driver: bridge
+        enable_ipv6: false
+        internal: false
+        ipam_config:
+          - subnet: 10.172.0.0/24
+            gateway: 10.172.0.1
+        force: true
+        state: present
+        labels:
+          owner: molecule
+
+...