feat(docker): add Gitea registry push script

scripts/docker_push.sh

@@ -0,0 +1,47 @@
+#!/usr/bin/env bash
+# scripts/docker_push.sh
+# Build and push Manual Slop image to Gitea container registry.
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+PROJECT_ROOT="$(dirname "$SCRIPT_DIR")"
+CREDS_FILE="$PROJECT_ROOT/credentials.toml"
+
+if [ ! -f "$CREDS_FILE" ]; then
+    echo "Error: credentials.toml not found at $CREDS_FILE"
+    exit 1
+fi
+
+CREDS_JSON=$(uv run python -c "
+import tomllib
+creds = tomllib.load(open('$CREDS_FILE', 'rb'))
+g = creds.get('gitea', {})
+print(g.get('registry_url', '') + '|' + g.get('username', '') + '|' + g.get('token', ''))
+")
+
+REGISTRY_URL=$(echo "$CREDS_JSON" | cut -d'|' -f1)
+GITEA_USER=$(echo "$CREDS_JSON" | cut -d'|' -f2)
+GITEA_TOKEN=$(echo "$CREDS_JSON" | cut -d'|' -f3)
+
+if [ -z "$REGISTRY_URL" ] || [ -z "$GITEA_USER" ] || [ -z "$GITEA_TOKEN" ]; then
+    echo "Error: gitea credentials incomplete in credentials.toml"
+    echo "Required: registry_url, username, token"
+    exit 1
+fi
+
+IMAGE_NAME="manual_slop:latest"
+FULL_TAG="${REGISTRY_URL}/${GITEA_USER}/${IMAGE_NAME}"
+
+echo "Building Docker image..."
+docker build -t "$IMAGE_NAME" "$PROJECT_ROOT"
+
+echo "Tagging for Gitea registry: $FULL_TAG"
+docker tag "$IMAGE_NAME" "$FULL_TAG"
+
+echo "Logging in to Gitea registry..."
+echo "$GITEA_TOKEN" | docker login "$REGISTRY_URL" -u "$GITEA_USER" --password-stdin
+
+echo "Pushing to Gitea registry..."
+docker push "$FULL_TAG"
+
+echo "Done! Image available at: $FULL_TAG"