group GitHub actions updates into a single PR, clarify Dockerfiles

Author: paskal

.github/dependabot.yml

@@ -9,6 +9,10 @@ updates:
     directory: "/"
     schedule:
       interval: "monthly"
+    groups:
+      "GitHub Actions updates":
+        patterns:
+          - "*"
   - package-ecosystem: "docker"
     directory: "/base.alpine"
     schedule:
@@ -20,4 +24,4 @@ updates:
   - package-ecosystem: "docker"
     directory: "/build.go"
     schedule:
-      interval: "monthly"
+      interval: "monthly"

base.alpine/Dockerfile

@@ -1,7 +1,7 @@
 FROM alpine:3.19
 
 LABEL org.opencontainers.image.authors="Umputun <umputun@gmail.com>"
-# https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file#docker
+# enables automatic changelog generation by tools like Dependabot
 LABEL org.opencontainers.image.source="https://github.com/umputun/baseimage"
 
 ENV \

base.scratch/Dockerfile

@@ -12,7 +12,7 @@ RUN \
 FROM scratch
 
 LABEL org.opencontainers.image.authors="Umputun <umputun@gmail.com>"
-# https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file#docker
+# enables automatic changelog generation by tools like Dependabot
 LABEL org.opencontainers.image.source="https://github.com/umputun/baseimage"
 
 ENV TZ=America/Chicago

build.go/Dockerfile

@@ -1,7 +1,7 @@
 FROM golang:1.22-alpine
 
 LABEL org.opencontainers.image.authors="Umputun <umputun@gmail.com>"
-# https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file#docker
+# enables automatic changelog generation by tools like Dependabot
 LABEL org.opencontainers.image.source="https://github.com/umputun/baseimage"
 
 ENV \