Added possibility to define your own j2 template string for Helm Chart

[lordgreg]

Requirements

• Filling out the template is required. Any pull request that does not include enough information to be reviewed in a timely manner may be closed at the maintainers' discretion.
• All new code requires tests to ensure against regressions
• Remember to set idealista:develop as base branch;

Description of the Change

This pull request adds the possibility to define your own j2 template (as string) when installing using HELM chart.

Benefits

you can define/create your own content for MS Teams Body instead of using the default teams.j2.

Possible Drawbacks

Layer-8. If user doesn't add the correct content to the variable, YAML syntax error can appear.

Working example:

...
prom2teams:
  j2_template: |
    {%- set
      theme_colors = {
        'resolved' : '2DC72D',
        'critical' : '8C1A1A',
        'severe' : '8C1A1A',
        'warning' : 'FF9A0B',
        'unknown' : 'CCCCCC'
      }
    -%}

    {
        "@type": "MessageCard",
        "@context": "http://schema.org/extensions",
        "themeColor": "{% if status=='resolved' %} {{ theme_colors.resolved }} {% else %} {{ theme_colors[msg_text.severity] }} {% endif %}",
        "summary": "{% if status=='resolved' %}(Resolved) {% endif %}{{ msg_text.summary }}",
        "title": "{% if status=='resolved' %}(Resolved) {% elif status=='unknown' %} (status unknown) {% endif %}{{ msg_text.name }}",
        "sections": [{
            "activityTitle": "{{ msg_text.summary }}",
            "facts": [{% if msg_text.extra_labels %}{% for key in msg_text.extra_labels %},{
                "name": "{{ key }}",
                "value": "{{ msg_text.extra_labels[key] }}"
            }{% endfor %}{% endif %}
            {% if msg_text.extra_annotations %}{% for key in msg_text.extra_annotations %},{
                "name": "{{ key }}",
                "value": "{{ msg_text.extra_annotations[key] }}"
            }{% endfor %}{% endif %}],
              "markdown": true
        }]
    }

...

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