Allow extra image tags on non-tag builds

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

@@ -50,6 +50,14 @@ on:
         description: >
           Multiline build args, one per line: KEY=VALUE (values may include spaces)
 
+      extra_tags:
+        description: >
+          Optional extra tags to apply to each image.
+          Accepts JSON array (e.g. ["latest", "main"]) or newline-separated list.
+        required: false
+        type: string
+        default: ""
+
       env:
         description: >
           Multiline env vars, one per line: KEY=VALUE
@@ -138,6 +146,7 @@ jobs:
         env:
           IMAGES: ${{ inputs.images }}
           BUILD_ARGS: ${{ inputs.build_args }}
+          EXTRA_TAGS_INPUT: ${{ inputs.extra_tags }}
           CI_TOKEN: ${{ secrets.ci_token }}
           TRIVY_SEVERITY: ${{ inputs.trivy_severity }}
         run: |
@@ -177,6 +186,25 @@ jobs:
             VERSION_TAGS+=("latest")
           fi
 
+          EXTRA_TAGS=()
+          if [ -n "$EXTRA_TAGS_INPUT" ]; then
+            if echo "$EXTRA_TAGS_INPUT" | jq -e . >/dev/null 2>&1; then
+              if ! echo "$EXTRA_TAGS_INPUT" | jq -e 'type == "array"' >/dev/null 2>&1; then
+                echo "inputs.extra_tags must be a JSON array" >&2
+                exit 1
+              fi
+              mapfile -t EXTRA_TAGS < <(echo "$EXTRA_TAGS_INPUT" | jq -r '.[]')
+            else
+              while IFS= read -r line; do
+                trimmed="${line#"${line%%[![:space:]]*}"}"
+                trimmed="${trimmed%"${trimmed##*[![:space:]]}"}"
+                [ -z "$trimmed" ] && continue
+                case "$trimmed" in \#*) continue;; esac
+                EXTRA_TAGS+=("$trimmed")
+              done <<< "$EXTRA_TAGS_INPUT"
+            fi
+          fi
+
           BUILD_ARG_FLAGS=()
           BUILD_ARGS_JSON="{}"
           if [ -n "$BUILD_ARGS" ]; then
@@ -256,6 +284,9 @@ jobs:
                 for ver in "${VERSION_TAGS[@]}"; do
                   TAGS+=("$FULL_IMAGE:$ver")
                 done
+                for extra in "${EXTRA_TAGS[@]}"; do
+                  TAGS+=("$FULL_IMAGE:$extra")
+                done
                 TAGS_JSON=$(printf '%s\n' "${TAGS[@]}" | jq -R . | jq -s .)
 
                 TARGET_NAME="img_${IDX}"
@@ -315,6 +346,9 @@ jobs:
               for ver in "${VERSION_TAGS[@]}"; do
                 TAGS+=("$FULL_IMAGE:$ver")
               done
+              for extra in "${EXTRA_TAGS[@]}"; do
+                TAGS+=("$FULL_IMAGE:$extra")
+              done
 
               TAG_ARGS=()
               for tag in "${TAGS[@]}"; do