Adding the workflow for the postfix

.github/workflows/docker-build.yml

@@ -0,0 +1,27 @@
+name: Build and Push Docker Image
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+
+    - name: Log in to Docker Hub
+      uses: docker/login-action@v1
+      with:
+        username: ${{ secrets.DOCKER_USERNAME }}
+        password: ${{ secrets.DOCKER_TOKEN }}
+
+    - name: Build the Docker image
+      run: docker build . -t k2patel/postfix:latest
+
+    - name: Push the Docker image
+      run: docker push k2patel/postfix
+

Dockerfile

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+#Postfix relay
+FROM docker.io/library/alpine:latest
+
+#     Variables for Labels:
+ARG VENDOR="k2patel"
+ARG COMPONENT="postfix-relay"
+ARG BUILD_DATE
+ARG GIT_REPO
+ARG VCS_REF
+ARG VERSION="1"
+ARG NAME="dockerized-${COMPONENT}"
+ARG DESCRIPTION="dockerized environment."
+ARG DOCUMENTATION="https://git.k2patel.in"
+ARG AUTHOR="k2patel<k2patel@live.com>"
+ARG LICENSE="MIT"
+#     END Variables
+
+#########################################
+LABEL org.label-schema.build-date="${BUILD_DATE}" \
+        org.label-schema.name="${NAME}" \
+        org.label-schema.description="${DESCRIPTION}" \
+        org.label-schema.vcs-ref="${VCS_REF}" \
+        org.label-schema.vcs-url="${GIT_REPO}" \
+        org.label-schema.url="${GIT_REPO}" \
+        org.label-schema.vendor="${VENDOR}" \
+        org.label-schema.version="${VERSION}" \
+        org.label-schema.usage="${DOCUMENTATION}"
+
+LABEL   org.opencontainers.image.created="${BUILD_DATE}" \
+        org.opencontainers.image.url="${GIT_REPO}" \
+        org.opencontainers.image.source="${GIT_REPO}" \
+        org.opencontainers.image.version="${VERSION}" \
+        org.opencontainers.image.revision="${VCS_REF}" \
+        org.opencontainers.image.vendor="${VENDOR}" \
+        org.opencontainers.image.title="${NAME}" \
+        org.opencontainers.image.description="${DESCRIPTION}" \
+        org.opencontainers.image.documentation="${DOCUMENTATION}" \
+        org.opencontainers.image.authors="${AUTHOR}" \
+        org.opencontainers.image.licenses="${LICENSE}"
+#########################################
+
+ENV TIMEZONE=${TIMEZONE}
+ENV SMTP_SERVER=${SMTP_SERVER}
+ENV SERVER_HOSTNAME=${SERVER_HOSTNAME}
+ENV SMTP_PORT=${SMTP_PORT}
+ENV DOMAIN=${DOMAIN}
+ENV SMTP_USERNAME=${SMTP_USERNAME}
+ENV SMTP_PASSWORD=${SMTP_PASSWORD}
+
+# Intall Needed Package
+RUN apk add --no-cache postfix libsasl supervisor ca-certificates bash rsyslog cyrus-sasl
+
+#Configure nodaemon mode for supervisord
+RUN sed -i -e "s/^nodaemon=false/nodaemon=true/" /etc/supervisord.conf
+#Change postfix to listen on all the interface
+RUN sed -i -e 's/inet_interfaces = localhost/inet_interfaces = all/g' /etc/postfix/main.cf
+
+COPY etc/ /etc/
+VOLUME ["/var/log", "/var/mail", "/var/spool/postfix"]
+COPY run.sh /
+RUN chmod +x /run.sh
+RUN newaliases
+
+EXPOSE 25
+
+ENTRYPOINT /usr/bin/supervisord -c /etc/supervisor/supervisord.conf
+