Use Alpine and Clean Up Dockerfile

.dockerignore

@@ -0,0 +1,44 @@
+# Git
+.git
+.gitignore
+.gitattributes
+
+# IDE
+.idea
+.vscode
+*.swp
+*.swo
+*~
+
+# Documentation
+*.md
+README.md
+LICENSE
+
+# CI/CD
+.github
+
+# Test files and sample data
+*_test.go
+test_utils.go
+sample-requests
+configtest
+
+# Build artifacts
+prebid-cache
+*.exe
+*.dll
+*.so
+*.dylib
+
+# Go vendor directory (created in container)
+vendor/
+
+# Temporary files
+*.tmp
+*.log
+.DS_Store
+
+# Docker
+Dockerfile*
+.dockerignore

.gitignore

@@ -11,6 +11,7 @@ prebid-cache
 
 # ide
 .vscode/
+.idea/
 
 # autogenerated mac file
 

Dockerfile

@@ -1,39 +1,38 @@
-FROM ubuntu:22.04 AS build
-RUN apt-get update && \
-    apt-get -y upgrade && \
-    apt-get install -y --no-install-recommends wget ca-certificates
-ENV GO_INSTALLER=go1.19.5.linux-amd64.tar.gz
-WORKDIR /tmp
-RUN wget https://dl.google.com/go/$GO_INSTALLER && \
-    tar -C /usr/local -xzf $GO_INSTALLER
-RUN mkdir -p /app/prebid-cache/
+FROM alpine:3.23 AS build
+
+RUN apk update && \
+    apk add --no-cache go=1.25.5-r0 git bash ca-certificates && \
+    rm -rf /var/cache/apk/*
+
+ENV GOPROXY="https://proxy.golang.org" \
+    CGO_ENABLED=0
+
 WORKDIR /app/prebid-cache/
-ENV GOROOT=/usr/local/go
-ENV PATH=$GOROOT/bin:$PATH
-ENV GOPROXY="https://proxy.golang.org"
-RUN apt-get update && \
-    apt-get install -y --no-install-recommends git && \
-    apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
-ENV CGO_ENABLED 0
-COPY ./ ./
+
+COPY go.mod go.sum ./
+RUN go mod download && go mod verify
+
+COPY . .
 RUN go mod vendor
-RUN go mod tidy
+
 ARG TEST="true"
 RUN if [ "$TEST" != "false" ]; then ./validate.sh ; fi
-RUN go build -mod=vendor -ldflags "-X github.com/prebid/prebid-cache/version.Ver=`git describe --tags` -X github.com/prebid/prebid-cache/version.Rev=`git rev-parse HEAD`" .
 
-FROM ubuntu:22.04 AS release
-LABEL maintainer="hans.hjort@xandr.com" 
-RUN apt-get update && \
-    apt-get install -y --no-install-recommends ca-certificates && \
-    apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+RUN go build -mod=vendor -ldflags "-X github.com/prebid/prebid-cache/version.Ver=$(git describe --tags 2>/dev/null || echo 'dev') -X github.com/prebid/prebid-cache/version.Rev=$(git rev-parse HEAD 2>/dev/null || echo 'unknown')" .
+FROM alpine:3.23 AS release
+LABEL maintainer="hans.hjort@xandr.com"
+
+RUN apk add --no-cache ca-certificates && \
+    rm -rf /var/cache/apk/*
+
+RUN addgroup -g 2001 -S prebidgroup && \
+    adduser -u 1001 -S -G prebidgroup prebid
+
 WORKDIR /usr/local/bin/
-COPY --from=build /app/prebid-cache/prebid-cache .
-RUN chmod a+xr prebid-cache
-COPY --from=build /app/prebid-cache/config.yaml .
-RUN chmod a+r config.yaml
-RUN addgroup --system --gid 2001 prebidgroup && adduser --system --uid 1001 --ingroup prebidgroup prebid
+
+COPY --from=build /app/prebid-cache/prebid-cache \
+                  /app/prebid-cache/config.yaml ./
+
 USER prebid
-EXPOSE 2424
-EXPOSE 2525
+EXPOSE 2424 2525
 ENTRYPOINT ["/usr/local/bin/prebid-cache"]