New deployment

.github/workflows/docker-publish.yaml

@@ -6,35 +6,61 @@ on:
       - '**'
     tags:
       - 'v*'
-
-permissions:
-  contents: read
+  pull_request:
+    branches:
+      - '**'
+    types:
+      - opened
+      - reopened
+      - synchronize
 
 jobs:
   build-and-push:
     runs-on: ubuntu-latest
+    permissions:
+      id-token: write
+      contents: read
+    outputs:
+      version_tag: ${{ steps.vars.outputs.version_tag }}
 
     steps:
       - name: Checkout
         uses: actions/checkout@v4
 
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+          cache: true
+
+      # Static binary so the runtime image can be distroless static-debian12.
+      # -trimpath strips host paths from the binary; -s -w drops debug info.
+      - name: Build Go binary (static)
+        env:
+          CGO_ENABLED: '0'
+          GOOS: linux
+          GOARCH: amd64
+        run: go build -trimpath -ldflags="-s -w" -o cantcost ./bin/main.go
+
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
-      # 1) Configure AWS creds (needed for ECR auth)
+      # IAM role gh-oidc-build-cantcost is provisioned in AWS account
+      # 903295530547 and trusts this repo's GitHub OIDC subject. Do not
+      # rename without updating the role's trust policy.
       - name: Configure AWS credentials
         uses: aws-actions/configure-aws-credentials@v4
         with:
-          aws-access-key-id: ${{ secrets.TF_AWS_ACCESS_KEY_ID }}
-          aws-secret-access-key: ${{ secrets.TF_AWS_SECRET_ACCESS_KEY }}
+          role-to-assume: arn:aws:iam::903295530547:role/gh-oidc-build-${{ github.event.repository.name }}
           aws-region: us-east-1
+          role-session-name: gha-${{ github.run_id }}
 
-      # 2) Login to Public ECR
       - name: Login to Amazon ECR Public
         id: login-ecr-public
         uses: aws-actions/amazon-ecr-login@v2
         with:
           registry-type: public
+          mask-password: true
 
       - name: Compute image tags
         id: vars
@@ -46,9 +72,11 @@ jobs:
 
           if [[ "${GITHUB_REF_TYPE}" == "tag" ]]; then
             TAG_NAME="${GITHUB_REF_NAME}"   # e.g. v1.2.3
+            echo "version_tag=${TAG_NAME}" >> $GITHUB_OUTPUT
             echo "tags=${IMAGE}:${TAG_NAME},${IMAGE}:latest" >> $GITHUB_OUTPUT
           else
             SHORT_SHA=$(echo "${GITHUB_SHA}" | cut -c1-7)
+            echo "version_tag=sha-${SHORT_SHA}" >> $GITHUB_OUTPUT
             echo "tags=${IMAGE}:sha-${SHORT_SHA}" >> $GITHUB_OUTPUT
           fi
 

Dockerfile

@@ -1,25 +1,22 @@
-# Stage 1: Build
-FROM golang:1.25-alpine AS builder
+# syntax=docker/dockerfile:1.7
+
+# Distroless static-debian12: ca-certificates + tzdata only. No glibc, no
+# shell, no package manager — minimum possible attack surface. Suitable
+# because the binary is built with CGO_ENABLED=0 (fully static).
+#
+# The :nonroot tag bakes in USER 65532:65532, so we can't be run as root.
+#
+# Pin by multi-arch index digest. Refresh with:
+#   docker buildx imagetools inspect gcr.io/distroless/static-debian12:nonroot
+FROM gcr.io/distroless/static-debian12:nonroot@sha256:a9329520abc449e3b14d5bc3a6ffae065bdde0f02667fa10880c49b35c109fd1
 
 WORKDIR /app
 
-COPY go.mod go.sum ./
-RUN go mod download
+# Binary is built on the host (CGO_ENABLED=0 go build) and copied in.
+# nonroot is UID/GID 65532, predefined in the distroless image.
+COPY --chown=nonroot:nonroot --chmod=0555 \
+     ./cantcost /usr/local/bin/cantcost
 
-COPY . .
+USER nonroot:nonroot
 
-RUN go build -o /log-catcher ./bin/main.go
-
-# Stage 2: Run
-FROM alpine:latest
-
-# You can add ca-certificates if your app needs TLS
-RUN apk --no-cache add ca-certificates
-
-WORKDIR /root/
-
-COPY --from=builder /log-catcher .
-
-EXPOSE 8080
-
-CMD ["./log-catcher"]
+ENTRYPOINT ["/usr/local/bin/cantcost"]