Refactor Dockerfile and build-migrations.yaml to use build arguments for architecture

Author: ngeorger

.github/workflows/build-migrations.yaml

@@ -138,7 +138,8 @@ jobs:
           outputs: type=image,name=${{ env.GHCR_IMAGE }},push-by-digest=true,name-canonical=true,push=true,oci-mediatypes=true
           cache-from: type=gha,scope=${{ github.repository }}-${{ github.ref_name }}-${{ matrix.platform }}
           cache-to: type=gha,scope=${{ github.repository }}-${{ github.ref_name }}-${{ matrix.platform }}
-
+          build-args: |
+            ARCH=${{ env.PLATFORM_PAIR }}
 
       - name: Export digest
         # This step exports the digest of the built image to a file.

migrate/Dockerfile

@@ -1,19 +1,17 @@
-FROM debian:bookworm-slim as builder
-
-# Set the ARCH variable by executing a command on the host.
-RUN --mount=type=bind,source=/etc/os-release,target=/etc/os-release,readonly \
-    ARCH=$(dpkg --print-architecture) && \
-    curl -L https://github.com/golang-migrate/migrate/releases/download/v4.17.1/migrate.linux-$ARCH.tar.gz | tar xvz && \
-    mv migrate /usr/bin/
-
-# Final stage
 FROM debian:bookworm-slim
 
-COPY --from=builder /usr/bin/migrate /usr/bin/migrate
+ARG ARCH="linux-amd64"
+
+RUN apt-get update -y && \
+    apt-get install -y curl && \
+    rm -rf /var/lib/apt/lists/* && \
+    curl -L https://github.com/golang-migrate/migrate/releases/download/v4.17.1/migrate.${ARCH}.tar.gz | tar xvz && \
+    mv migrate /usr/bin/
 
 COPY bin /usr/local/bin
+
 COPY ./migrations /migrations
 
 ENV MYSQL_DB=""
 
-CMD ["up"]
+CMD ["up"]