feat:#65 increased OCI image base images versions, slightly optimized Dockerfiles and adjust docker-compose.yml's to make them OCI compliant

services/data-manager/Dockerfile

@@ -15,7 +15,7 @@
 #along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 # build stage
-FROM golang:alpine AS build
+FROM docker.io/golang:alpine AS build
 
 WORKDIR /htwkalender-data-manager
 
@@ -29,20 +29,19 @@ COPY common/. ./common
 RUN CGO_ENABLED=1 GOOS=linux go build -o /htwkalender-data-manager data-manager/main.go
 
 # production stage
-FROM alpine:3.20.1 AS prod
+FROM docker.io/alpine:3.21 AS prod
 
 WORKDIR /htwkalender-data-manager
 
 ARG USER=ical
 RUN adduser -Ds /bin/sh "$USER" && \
-    chown "$USER":"$USER" ./
-
-USER $USER
-RUN mkdir -p data
+    mkdir -p data && \
+    chown -R "$USER":"$USER" ./
 
 # copies executable from build container
-COPY --chown=$USER:$USER --chmod=644 --from=build /htwkalender-data-manager ./
-RUN chmod +x main
+COPY --chown=$USER:$USER --chmod=744 --from=build /htwkalender-data-manager ./
+
+USER $USER
 
 # Expose port 8090 to the outside world
 EXPOSE 8090

services/ical/Dockerfile

@@ -15,7 +15,7 @@
 #along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 # build stage
-FROM golang:alpine AS build
+FROM docker.io/golang:alpine AS build
 
 WORKDIR /htwkalender-ical
 
@@ -29,19 +29,19 @@ COPY common/. ./common
 RUN CGO_ENABLED=1 GOOS=linux go build -o /htwkalender-ical ical/main.go
 
 # production stage
-FROM alpine:latest AS prod
+FROM docker.io/alpine:3.21 AS prod
 
 WORKDIR /htwkalender-ical
 
 ARG USER=ical
-RUN adduser -Ds /bin/sh $USER && \
-    chown $USER:$USER ./
-
-USER $USER
-RUN mkdir -p data
+RUN adduser -Ds /bin/sh "$USER" && \
+    mkdir -p data && \
+    chown -R "$USER":"$USER" ./
 
 # copies executable from build container
-COPY --chown=$USER:$USER --from=build /htwkalender-ical ./
+COPY --chown=$USER:$USER --chmod=744 --from=build /htwkalender-ical ./
+
+USER $USER
 
 # Expose port 8091 to the outside world
 EXPOSE 8091