feat: adiciona Dockerfile e integração com CI/CD

- Adiciona Dockerfile multi-stage usando Oracle Linux 9
- Instala Oracle Instant Client via RPM
- Adiciona .dockerignore para otimizar builds
- Integra build Docker no GitHub Actions CI
- Configura push automático para GitHub Container Registry

Dockerfile

@@ -0,0 +1,61 @@
+FROM oraclelinux:9 AS base
+
+WORKDIR /app
+
+RUN dnf install -y \
+    curl \
+    libaio \
+    && curl -fsSL https://rpm.nodesource.com/setup_20.x | bash - \
+    && dnf install -y nodejs \
+    && dnf clean all
+
+FROM base AS dependencies
+
+COPY package*.json ./
+
+RUN npm ci --only=production && npm cache clean --force
+
+FROM base AS build
+
+COPY package*.json ./
+
+RUN npm ci
+
+COPY . .
+
+RUN npm run build
+
+FROM base AS production
+
+RUN dnf install -y \
+    curl \
+    libaio \
+    && dnf clean all
+
+ENV ORACLE_CLIENT_LIB_DIR=/usr/lib/oracle/21/client64/lib
+
+RUN curl -fSL --cookie-jar /tmp/cookies.txt --retry 3 \
+    "https://download.oracle.com/otn_software/linux/instantclient/2112000/el9/oracle-instantclient-basiclite-21.12.0.0.0-1.el9.x86_64.rpm" \
+    --output /tmp/oracle-instantclient-basiclite.rpm && \
+    dnf install -y /tmp/oracle-instantclient-basiclite.rpm && \
+    rm -f /tmp/oracle-instantclient-basiclite.rpm /tmp/cookies.txt && \
+    dnf clean all
+
+ENV LD_LIBRARY_PATH=/usr/lib/oracle/21/client64/lib:$LD_LIBRARY_PATH
+ENV TZ=America/Sao_Paulo
+
+RUN groupadd -r node && useradd -r -g node node
+
+COPY --from=dependencies /app/node_modules ./node_modules
+COPY --from=build /app/dist ./dist
+COPY --from=build /app/package*.json ./
+COPY --from=build /app/cert ./cert
+
+RUN chown -R node:node /app
+
+EXPOSE 8066
+
+USER node
+
+CMD ["node", "dist/main"]
+