Include an experimental tag for... experiments.

Signed-off-by: Adam Warner <me@adamwarner.co.uk>

.github/workflows/build-and-publish.yml

@@ -5,6 +5,7 @@ on:
   push:
     branches:
       - development
+      - experimental
   release:
     types: [published]
 
@@ -68,7 +69,8 @@ jobs:
             latest=${{ startsWith(github.ref, 'refs/tags/') }}
           tags: |
             type=schedule,pattern=nightly
-            type=raw,value=nightly,enable=${{ github.event_name == 'push' }}
+            type=raw,value=nightly,enable=${{ github.event_name == 'push' && github.ref == 'refs/heads/development' }}
+            type=raw,value=experimental,enable=${{ github.event_name == 'push' && github.ref == 'refs/heads/experimental' }}
             type=ref,event=tag
 
       - &login-dockerhub

src/start.sh

@@ -20,6 +20,19 @@ start() {
     # shellcheck source=/dev/null
     . /usr/bin/bash_functions.sh
 
+    # Warn about experimental builds
+    if [ -f /pihole.docker.tag ] && grep -q "experimental" /pihole.docker.tag; then
+        echo ""
+        echo "  ⚠⚠⚠ WARNING ⚠⚠⚠"
+        echo "  [!] This is an EXPERIMENTAL build of Pi-hole Docker"
+        echo "  [!] This build may be unstable or contain breaking changes"
+        echo "  [!] Use only if you have been asked to by the Pi-hole team"
+        echo "  [!] Report any issues to: https://github.com/pi-hole/docker-pi-hole/issues"
+        echo "  ⚠⚠⚠ WARNING ⚠⚠⚠"
+        echo ""
+        sleep 5
+    fi
+
     # If the file /etc/pihole/setupVars.conf exists, but /etc/pihole/pihole.toml does not, then we are migrating v5->v6
     # FTL Will handle the migration of the config files
     if [[ -f /etc/pihole/setupVars.conf && ! -f /etc/pihole/pihole.toml ]]; then