Add Dockerfile for custom prometheus scraper

monitoring/prometheus/Dockerfile

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+FROM prom/prometheus
+LABEL maintainer="pub.solar <crew@pub.solar>"
+
+COPY src /

monitoring/prometheus/Makefile

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+IMAGE=registry.greenbaum.cloud/pub_solar/prometheus
+
+build:
+	docker build -t $(IMAGE) .
+
+push:
+	docker push $(IMAGE)

monitoring/prometheus/src/etc/prometheus/prometheus.yml

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+# my global config
+global:
+  scrape_interval: 15s # Set the scrape interval to every 15 seconds. Default is every 1 minute.
+  evaluation_interval: 15s # Evaluate rules every 15 seconds. The default is every 1 minute.
+  # scrape_timeout is set to the global default (10s).
+
+# Alertmanager configuration
+#alerting:
+#  alertmanagers:
+#    - static_configs:
+#        - targets:
+#          # - alertmanager:9093
+
+# Load rules once and periodically evaluate them according to the global 'evaluation_interval'.
+#rule_files:
+  # - "first_rules.yml"
+  # - "second_rules.yml"
+
+# A scrape configuration containing exactly one endpoint to scrape:
+# Here it's Prometheus itself.
+scrape_configs:
+  # The job name is added as a label `job=<job_name>` to any timeseries scraped from this config.
+  - job_name: "cloud_pub_solar_metrics"
+
+    # metrics_path defaults to '/metrics'
+    # scheme defaults to 'http'.
+    scheme: https
+
+    static_configs:
+      - targets: ["cloud.pub.solar:443"]