Add Dockerfile

Dockerfile

@@ -0,0 +1,62 @@
+ARG HOMEDIR=/opt/app
+ARG WALG_TARGET=pg
+ARG USER=101
+ARG GROUP=103
+# Build the manager binary
+FROM rust:1.70.0-alpine3.18 AS builder
+
+ARG WALG_TARGET
+ARG WALG_VERSION
+ARG APP_NAME
+ARG APP_VERSION
+ARG LOG_PKG_PATH
+ARG APP_PKG_PATH
+ARG WALG_DOWNLOAD_URL=https://github.com/wal-g/wal-g/releases/download
+ARG HOMEDIR
+
+WORKDIR /workspace
+
+COPY src/ src/
+COPY Cargo.lock Cargo.lock
+COPY Cargo.toml Cargo.toml
+COPY log4rs.yml log4rs.yml
+
+RUN ls -al /workspace/src
+
+# Build
+RUN apk add --no-cache musl-dev && \
+    rustup target add x86_64-unknown-linux-musl && \
+    cargo build --release --locked --target=x86_64-unknown-linux-musl
+
+# Download wal-g binary
+RUN wget -qO- ${WALG_DOWNLOAD_URL}/${WALG_VERSION}/wal-g-${WALG_TARGET}-ubuntu-20.04-amd64.tar.gz | tar xvz && \
+        mv wal-g-${WALG_TARGET}-ubuntu-20.04-amd64 target/x86_64-unknown-linux-musl/release/wal-g-postgres
+
+RUN mkdir -p ${HOMEDIR} && \
+    echo "app:x:${USER}:app" >> /etc/group && \
+    echo "app:x:${USER}:${GROUP}:app user:${HOMEDIR}:/sbin/nologin" >> /etc/passwd && \
+    chown app:app target/x86_64-unknown-linux-musl/release/wal-g-exporter && \
+    chown app:app target/x86_64-unknown-linux-musl/release/wal-g-postgres && \
+    chown -R app:app ${HOMEDIR} && \
+    chmod -R g+rw ${HOMEDIR} && \
+    chmod u+rwx target/x86_64-unknown-linux-musl/release/wal-g-exporter && \
+    chmod u+rwx target/x86_64-unknown-linux-musl/release/wal-g-postgres
+
+# Use distroless as minimal base image to package the manager binary
+# Refer to https://github.com/GoogleContainerTools/distroless for more details
+FROM gcr.io/distroless/base:latest
+ARG HOMEDIR
+ARG WALG_TARGET
+ARG USER
+ARG GROUP
+
+COPY --chown=${USER}:${GROUP} --from=builder ${HOMEDIR} ${HOMEDIR}
+COPY --from=builder /etc/passwd /etc/passwd
+COPY --from=builder /workspace/target/x86_64-unknown-linux-musl/release/wal-g-exporter /usr/bin/wal-g-exporter
+COPY --from=builder /workspace/target/x86_64-unknown-linux-musl/release/wal-g-postgres /usr/bin/wal-g-${WALG_TARGET}
+COPY --from=builder /workspace/log4rs.yml ${HOMEDIR}/
+
+WORKDIR ${HOMEDIR}
+USER ${USER}
+
+ENTRYPOINT ["/usr/bin/wal-g-exporter"]