add ca-certificates to gas-oracle and rollup-relayer

build/dockerfiles/gas_oracle.Dockerfile

@@ -14,8 +14,6 @@ RUN go mod download -x
 # Build gas_oracle
 FROM base as builder
 
-RUN apt-get install ca-certificates -y
-
 RUN --mount=target=. \
     --mount=type=cache,target=/root/.cache/go-build \
     cd /src/rollup/cmd/gas_oracle/ && CGO_LDFLAGS="-ldl" go build -v -p 4 -o /bin/gas_oracle
@@ -23,6 +21,8 @@ RUN --mount=target=. \
 # Pull gas_oracle into a second stage deploy ubuntu container
 FROM ubuntu:20.04
 
+RUN apt update && apt install ca-certificates -y
+
 ENV CGO_LDFLAGS="-ldl"
 
 COPY --from=builder /bin/gas_oracle /bin/

build/dockerfiles/rollup_relayer.Dockerfile

@@ -14,8 +14,6 @@ RUN go mod download -x
 # Build rollup_relayer
 FROM base as builder
 
-RUN apt-get install ca-certificates -y
-
 RUN --mount=target=. \
     --mount=type=cache,target=/root/.cache/go-build \
     cd /src/rollup/cmd/rollup_relayer/ && CGO_LDFLAGS="-ldl" go build -v -p 4 -o /bin/rollup_relayer
@@ -23,6 +21,8 @@ RUN --mount=target=. \
 # Pull rollup_relayer into a second stage deploy ubuntu container
 FROM ubuntu:20.04
 
+RUN apt update && apt install ca-certificates -y
+
 ENV CGO_LDFLAGS="-ldl"
 
 COPY --from=builder /bin/rollup_relayer /bin/