Ignore leading forward-slash in git branch and tag names, as it has n…

…o meaning (https://stackoverflow.com/a/3651867)

.cicd/docker-tag.sh

@@ -4,8 +4,8 @@ echo '+++ :evergreen_tree: Configuring Environment'
 REPO='eosio/ci-contracts-builder'
 PREFIX='base-ubuntu-18.04'
 IMAGE="$REPO:$PREFIX-$BUILDKITE_COMMIT-$PLATFORM_TYPE"
-SANITIZED_BRANCH=$(echo "$BUILDKITE_BRANCH" | tr '/' '_')
-SANITIZED_TAG=$(echo "$BUILDKITE_TAG" | tr '/' '_')
+SANITIZED_BRANCH=$(echo "$BUILDKITE_BRANCH" | sed 's.^/..' | tr '/' '_')
+SANITIZED_TAG=$(echo "$BUILDKITE_TAG" | sed 's.^/..' | tr '/' '_')
 echo '+++ :arrow_down: Pulling Container'
 echo "Pulling \"$IMAGE\""
 docker pull "$IMAGE"

.cicd/installation-build.sh

@@ -2,7 +2,7 @@
 set -eo pipefail
 . ./.cicd/helpers/general.sh
 export ENABLE_INSTALL=true
-export BRANCH=$(echo $BUILDKITE_BRANCH | tr '/' '_')
+export BRANCH=$(echo $BUILDKITE_BRANCH | sed 's.^/..' | tr '/' '_')
 export CONTRACTS_BUILDER_TAG="eosio/ci-contracts-builder:base-ubuntu-18.04"
 export ARGS="--name ci-contracts-builder-$BUILDKITE_PIPELINE_SLUG-$BUILDKITE_BUILD_NUMBER --init -v $(pwd):$MOUNTED_DIR"
 $CICD_DIR/build.sh