Miscellaneous improvements

* Dockerfile.almalinux
  Dockerfile.ubuntu
  - Use main branch of action-runners - for now

* build-files/build-image.sh
  - Remove /home/ubuntu/.nuget to free >2GB as it was only there for action runners build

Author: nealef

Dockerfile.almalinux

@@ -14,11 +14,10 @@ COPY    ${RUNNERPATCH} /tmp/runner.patch
 RUN     cd /tmp && \
         git clone -q ${RUNNERREPO} && \
         cd runner && \
-        git checkout $(git describe --tags $(git rev-list --tags --max-count=1)) -b build && \
-        git apply /tmp/runner.patch && \
-        sed -i'' -e 's/"version": "8[^"]*"/"version": "'${SDK_VERSION}'"/' src/global.json && \
-        sed -i'' -e 's/"version": "8[^"]*"/"version": "'${SDK_VERSION}'"/' .devcontainer/devcontainer.json && \
-        sed -i'' -e 's/DOTNETSDK_VERSION="8[^"]*"/DOTNETSDK_VERSION="'${SDK_VERSION}'"/' src/dev.sh
+        git checkout main -b build && \
+        # git checkout $(git describe --tags $(git rev-list --tags --max-count=1)) -b build && \
+        sed -i'' -e /version/s/8......\"$/${SDK}.0.100\"/ src/global.json && \
+        git apply /tmp/runner.patch 
 
 RUN     cd /tmp/runner/src && \
         ./dev.sh layout && \

Dockerfile.ubuntu

@@ -1,16 +1,14 @@
-FROM    ubuntu:22.04
+FROM    ubuntu:24.10
 
 ARG     RUNNERREPO="https://github.com/actions/runner" RUNNERPATCH SDK_VERSION ARCH
 
 ENV     DEBIAN_FRONTEND=noninteractive
 
 RUN     apt-get -qq update -y && \
-        apt-get -qq -y install wget git sudo alien curl && \
+        apt-get -qq -y install wget git sudo curl dotnet-sdk-8.0 && \
         apt autoclean
 
-RUN     apt-get -qq -y install dotnet-sdk-8.0  && \
-        SDK_VERSION=`dotnet --version` && \
-        echo "Using SDK - ${SDK_VERSION}"
+RUN     echo "Using SDK - `dotnet --version`"
 
 ADD     ${RUNNERPATCH} /tmp/runner.patch
 

build-files/build-image.sh

@@ -92,7 +92,7 @@ install_runner() {
 
 cleanup() {
     rm -rf /home/ubuntu/build-image.sh /home/ubuntu/runner-sdk-8.patch \
-           /tmp/runner /tmp/preseed-yaml
+           /tmp/runner /tmp/preseed-yaml /home/ubuntu/.nuget
 }
 
 run() {