Initial commit

Drone CI steps, Dockerfile for ENV arguments and README.md

Dockerfile

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+FROM nginxinc/nginx-unprivileged:alpine-slim
+
+# Set default environment variables
+ENV REDIRECT_TARGET="https://example.com" \
+    REDIRECT_CODE="301" \
+    LISTEN_PORT="8080" \
+    NGINX_ENVSUBST_FILTER="REDIRECT_TARGET REDIRECT_CODE LISTEN_PORT"
+
+# Copy template for automatic envsubst rendering on startup
+COPY templates/default.conf.template /etc/nginx/templates/default.conf.template
+
+# Default unprivileged port
+EXPOSE 8080