add renovate for PROMETHEUS_CPP

.github/renovate.json

@@ -2,5 +2,16 @@
     "$schema": "https://docs.renovatebot.com/renovate-schema.json",
     "extends": [
         "local>USA-RedDragon/renovate-configs"
+    ],
+    "regexManagers": [
+        {
+            "fileMatch": [
+                ".*"
+            ],
+            "matchStrings": [
+                "# renovate: datasource=(?<datasource>.*?)(?:\\s+extractVersion=(?<extractVersion>.+?))?(?:\\s+versioning=(?<versioning>.+?))?\\s+depName=(?<depName>.+?)?\\s(?:\\s*.*_(?:version|VERSION)[:=]\\s*(?<currentValue>.*))?(?:\\s.*_(?:ref|REF):\\s+(?<currentDigest>.*))?"
+            ],
+            "versioningTemplate": "{{#if versioning}}{{versioning}}{{else}}semver-coerced{{/if}}"
+        }
     ]
 }

Dockerfile

@@ -3,11 +3,11 @@ FROM ubuntu:22.04 as prometheus-cpp-builder
 RUN apt update && export DEBIAN_FRONTEND=noninteractive && \
     apt install -y curl git cmake build-essential file zlib1g-dev && rm -rf /var/lib/apt/lists/*
 
+# renovate: datasource=github-tags depName=jupp0r/prometheus-cpp
 ARG PROMETHEUS_CPP_VERSION=v1.1.0
 
-RUN git clone https://github.com/jupp0r/prometheus-cpp /tmp/prometheus-cpp && \
+RUN git clone https://github.com/jupp0r/prometheus-cpp -b ${PROMETHEUS_CPP_VERSION} /tmp/prometheus-cpp && \
     cd /tmp/prometheus-cpp && \
-    git checkout ${PROMETHEUS_CPP_VERSION} && \
     git submodule init && \
     git submodule update && \
     mkdir build && \