[infra] proposing detailed Multistage Dockerfile (#69)

* proposing detailed Multistage Dockerfile

* removing leftovers

.dockerignore

@@ -0,0 +1,10 @@
+# git + GitHub stuff
+.git*
+*.yml
+
+# Markdown
+README.md
+LICENSE.md
+
+Dockerfile*
+Makefile

Dockerfile

@@ -2,20 +2,28 @@
 # Stage 1: Build
 #===============
 
-FROM golang:1.21-alpine as builder
+FROM golang:1.22-alpine AS builder
 
-COPY . /app
+WORKDIR /src
 
-WORKDIR /app
+RUN --mount=type=cache,target=/go/pkg/mod/ \
+    --mount=type=cache,target=/root/.cache/go-build \
+    --mount=type=bind,source=go.sum,target=go.sum \
+    --mount=type=bind,source=go.mod,target=go.mod \
+    go mod download -x
 
-RUN go build -o indexer ./cmd
+ENV CGO_ENABLED=0 GOOS=linux 
+
+RUN --mount=type=cache,target=/go/pkg/mod/ \
+    --mount=type=cache,target=/root/.cache/go-build \
+    --mount=type=bind,target=. \
+    go build -o /app/indexer ./cmd
 
 #===============
 # Stage 2: Run
 #===============
 
-FROM alpine
+FROM alpine:3.20 AS tx-indexer
 
 COPY --from=builder /app/indexer /usr/local/bin/indexer
-
 ENTRYPOINT [ "/usr/local/bin/indexer" ]

Dockerfile.release

@@ -1,3 +1,5 @@
+# This Dockerfile is only useful for Goreleaser task
+# https://goreleaser.com/customization/docker/
 FROM scratch
 COPY tx-indexer /
 ENTRYPOINT [ "/tx-indexer" ]