Test and document Alpine 3.18.6

Remove exclusion that blocked dependabot update

Author: MarkEWaite

.github/dependabot.yml

@@ -64,11 +64,10 @@ updates:
 
   # Maintain dependencies for Alpine 3.18
   - package-ecosystem: "docker"
-    directory: "src/test/resources/org/jvnet/hudson/plugins/platformlabeler/alpine/3.18.5"
+    directory: "src/test/resources/org/jvnet/hudson/plugins/platformlabeler/alpine/3.18.6"
     ignore:
     - dependency-name: "Dockerfile"
       update-types: ["version-update:semver-minor"]
-      versions: [">= 3.19.0"]
     labels:
     - "skip-changelog"
     schedule:

README.md

@@ -15,7 +15,7 @@ Labels commonly include operating system name, version, architecture, and Window
 | Alma Linux 9               | `AlmaLinux`        | `9.3`          | `amd64`      | // EOL: 31 May 2032
 | Alpine 3.16                | `Alpine`           | `3.16.9`       | `amd64`      | // EOL: 01 May 2024
 | Alpine 3.17                | `Alpine`           | `3.17.6`       | `amd64`      | // EOL: 01 Nov 2024
-| Alpine 3.18                | `Alpine`           | `3.18.5`       | `amd64`      | // EOL: 01 May 2025
+| Alpine 3.18                | `Alpine`           | `3.18.6`       | `amd64`      | // EOL: 01 May 2025
 | Alpine 3.19                | `Alpine`           | `3.19.1`       | `amd64`      | // EOL: 01 Nov 2025
 | Amazon Linux 2023          | `Amazon`           | `2023`         | `amd64`      | // EOL: 15 Mar 2028
 | Clear Linux                | `clear-linux-os`   | `40690`        | `amd64`      |

src/test/resources/org/jvnet/hudson/plugins/platformlabeler/alpine/3.18.5/Dockerfile

@@ -0,0 +1 @@
+FROM alpine:3.18.6

src/test/resources/org/jvnet/hudson/plugins/platformlabeler/alpine/3.18.6/Dockerfile

@@ -1,6 +1,6 @@
 NAME="Alpine Linux"
 ID=alpine
-VERSION_ID=3.18.5
+VERSION_ID=3.18.6
 PRETTY_NAME="Alpine Linux v3.18"
 HOME_URL="https://alpinelinux.org/"
 BUG_REPORT_URL="https://gitlab.alpinelinux.org/alpine/aports/-/issues"