Install .NET 9

Dockerfile

@@ -1,24 +1,24 @@
-# Container image that runs your code
-FROM alpine:3.18
-
-# Install necessary dependencies
-RUN apk update && \
-    apk add --no-cache wget bash ca-certificates-bundle libgcc libssl3 libstdc++ zlib icu-libs && \
-    rm -rf /var/cache/apk/*
-
-# Download and install .NET Core SDK
-RUN wget -q https://dot.net/v1/dotnet-install.sh -O dotnet-install.sh && \
-    chmod +x dotnet-install.sh && \
-    ./dotnet-install.sh --version latest --install-dir /usr/share/dotnet && \
-    rm dotnet-install.sh
-
-# Add .NET to the PATH environment variable
-ENV PATH="$PATH:/usr/share/dotnet"
-
-# Copies your code file from your action repository to the filesystem path `/` of the container
-COPY entrypoint.sh /entrypoint.sh
-
-RUN chmod +x /entrypoint.sh
-
-# Code file to execute when the docker container starts up (`entrypoint.sh`)
+# Container image that runs your code
+FROM alpine:3.18
+
+# Install necessary dependencies
+RUN apk update && \
+    apk add --no-cache wget bash ca-certificates-bundle libgcc libssl3 libstdc++ zlib icu-libs && \
+    rm -rf /var/cache/apk/*
+
+# Download and install .NET Core SDK
+RUN wget -q https://dot.net/v1/dotnet-install.sh -O dotnet-install.sh && \
+    chmod +x dotnet-install.sh && \
+    ./dotnet-install.sh --channel 9.0 --install-dir /usr/share/dotnet && \
+    rm dotnet-install.sh
+
+# Add .NET to the PATH environment variable
+ENV PATH="$PATH:/usr/share/dotnet"
+
+# Copies your code file from your action repository to the filesystem path `/` of the container
+COPY entrypoint.sh /entrypoint.sh
+
+RUN chmod +x /entrypoint.sh
+
+# Code file to execute when the docker container starts up (`entrypoint.sh`)
 ENTRYPOINT ["/entrypoint.sh"]