feat(template): pin docker images (#107)

Signed-off-by: Steffen Exler <[email protected]>

_template/Dockerfile

@@ -1,7 +1,7 @@
 # syntax = docker/dockerfile:1.2
 
 # get modules, if they don't change the cache can be used for faster builds
-FROM golang AS base
+FROM golang:1.18@sha256:12d3995156cb0dcdbb9d3edb5827e4e8e1bf5bf92436bfd12d696ec997001a9a AS base
 ENV GO111MODULE=on
 ENV CGO_ENABLED=0
 ENV GOOS=linux
@@ -22,7 +22,7 @@ RUN --mount=target=. \
     go build -ldflags="-w -s" -o /app/main ./cmd/{{.Base.appName}}/*.go
 
 # Import the binary from build stage
-FROM gcr.io/distroless/static:nonroot as prd
+FROM gcr.io/distroless/static:nonroot@sha256:2556293984c5738fc75208cce52cf0a4762c709cf38e4bf8def65a61992da0ad as prd
 COPY --from=build /app/main /
 # this is the numeric version of user nonroot:nonroot to check runAsNonRoot in kubernetes
 USER 65532:65532